Sunday, September 10, 2017

GEDmatch Admixture (heritage) Dodecad, Triangulated Groups and Finding Bio Family

Using Dodecad with Triangulated Groups

My Admixture combination of choice is found under Admixture (heritage) Dodecad and Chromosome Painting Reduced Size.

Next, enter your kit number and pull-down to select World 9.

Your result will be something like this.

When you rotate the image you see this view. (I prefer visuals to help me better understand stuff like this.) (Chr 1-22)

I use Admixture (heritage) chose Dodecad in conjunction with the proportions tool. (Note: these are not percentages because the size of each chromosome differs.)

On GEDmatch when we look at the Chromosome Browser we are looking at this view. The browser starts with Chromosome 1 at the top and goes down to Chromosome 23. This view is based on chromosomes if they were the same size. The GEDmatch creators (they are geniuses) alert you by using different colors along with text stating the start and stop points.

When we look at Triangulated Graphic Tree we see this view of a chromosome browser at the far left of the full graphic with tree branches. (See post on this blog, "GEDmatch Triangulation Tree Graphic: What the Heck Am I Looking At?"

If you use the Chromosome Comparison on FTDNA (Family Tree DNA) Family Finder you will see a view something like this:

Consistency with visuals is important for me. (I am one of those people who need to turn a paper map the direction I am facing--- (I don't have a Smart Phone. I have too many other learning curves right now--Genomate Pro and Open Broadcast are challenges--please send the best resources to me via comments.)

Now, when I have a triangulation group, I like to run this to get an idea of who they might be through their start and end position on the chromosome chart. I hope it will help me further determine which line contains which ethnicity. When I discover a MRCA (most recent common ancestor) for a TG (triangulation group) and I see the same ethnic mix on another unidentified chromosome; I have a better idea of what line I am following. It may well be the same MRCA, or someone further back in the same line. 

This also helps adoptees if one side of the bio family has a specific ethnic mix and the other does not.

Full siblings compared to see the similarities on the different chromosomes:

Full sibling 1

Sibling 2

Full sibling females with overlay.

Now, look at half-sibling females.

Half-sib female 1

The differences have to be studied closely.

Half-sibling Female 2

Half-sibling females overlay Chromosomes 1-22

One must observe what remains as well as what is missing. Because the women share the same maternal line, the small proportions of Amerindian, African, and Australasian are canceled out as not in common which leaves me to consider that all of these (though small amounts can be noise) might be present on one or both of the paternal sides. On the other hand, by observing what is in common, and doing quick calculations using proportions between these half-sibling females, (while taking into account differences that are unique to each individual during recombination) it is possible the bio-mother adds more Southern and Caucasus Gedrosia DNA to the half-siblings than their respective biological fathers. 

We must remember, Admixtures for heritage are continuing to be refined as more tests are performed world-wide. The results are subject to change as more metadata is included. 

(Which reminds me, if you are concerned about DNA and privacy there is a fantastic new documentary entitled, The Good American. It is about the NSA Thin Tread prototype program that gathered metadata AND guarded personal privacy. Thin Thread was replaced with the Trailblazer Project which removed the protection to personal privacy and that should concern everyone.)   

Happy Finding!

Tuesday, August 22, 2017

Balancing Genealogy and Life

I realized that in my following my passion, life seems to click. Everything flowing--- the way life should always be. I also realized I needed some balance. Life has a way of alerting you when you don't get enough balance. Eighteen hour days sitting a the computer, writing emails, answering emails, writing a book, answering phone calls from friends and family asking, "How do I...?" (that's one of the things I love the most), trying new combinations of online genealogy tools; it was taking a toll on my health. I needed some exercise.

My sister, Gretchen arrived in town with my two great-nephew's (ages four and five). A weekend planned full of family fun. We went to Kiddie Park that evening; a local favorite for parents and children. The park has water boat rides, a kiddie roller-coaster, bumper cars, a train ride, caged Ferris Wheel, spinner ride, airplanes, pop-corn, cotton candy and much, much more.

Clowning Around


I even introduced Santa to my great-nephews. They promised they wouldn't tell anyone he spends his summers incognito at Kiddie Park, using his pretend name, Ron Adams.

The Blundering DNA Genealogist with Santa at Christmas.

We had a blast at the park. (I could barely keep up.)

The next morning, my son and I took the boys to Windle's Rock Shop. Tom Windle is not only an expert on minerals and rocks, he is also a wonderful historian and genealogist. Tom told us about the major turning point of the Revolutionary War--- The Battle of King's Mountain and his Patriot ancestor, John Sevier.  For information about this historic battle click HERE. You might find some of your own Patriot relatives who fought in this battle click HERE. (If you have one who is not on this list; join WikiTree and add them.)

A member of Tom's staff told us where we might find some good fossils. No luck with the fossils, but we found some locust exoskeletons and a golf ball. We enjoyed whispering in the band-shell and hearing our voices echo from one end to the other.

I was so stiff and sore I could barely move.

The next morning my son took the boys on a trip to Woolaroc Museum. The trip was almost a bust. An electrical storm had knocked out the power. Once again, Uncle Vern to the rescue. He sweet talked a museum groundsman to allow them a climb up the tower.

Once back in town, their NeNe took them to a local pool with corkscrew slides.

I was home; again playing on the computer (not spending time with my sister and nephews during their short visit), and a phone call came. (Remember: Life has a way to alert you when your are out of balance.)

My sister slipped and fell at the pool. An ambulance was taking her to the hospital. I was needed for my great-nephews.

Funny how when in a crisis with your mind focused on others, all of your aches and pains disappear.

I rushed to the pool. Medics were ready to load my sister (neck immobilize and strapped on a gurney) in the ambulance.  My nephews calmed; we hurried home. My son had arrived, and after a few calls to family, I was off to the hospital.

Cousin (they call him Uncle) Vern to the rescue again! He took the boys on another rock hunt. Success! The boys found some fossils near a creek.

My sister had a pretty severe concussion and they released her with orders to stay in bed for at least a day...and not to hit her head on concrete for another thirty days, or she might have some problems. (They actually said that.) Oh, the wonders of modern medicine!

After my sis and nephews departed, my son and I went fossil hunting. Success big time. I'm glad I took my reusable grocery bags; the fanny pack was way too small.

Big storm that night. Up again the next morning, perfect hunting conditions. Finding the fossils was like collecting pieces of ice after a hail storm.

Oh, my aching back! My bend-over gave out. The area was too wet and muddy to sit on the ground.

And we went AGAIN the next day. I took a trash bag to sit on (just in case). My youngest sister, Stella, went with us this time. Over a hundred pounds of fossils later---what do you do with a hundred pounds of fossils?
Horn Coral
Vern's Cherokee Native American name is Stonemaker. He loves rocks, teaches knapping classes, and does stone art.

 Polishing the coral exposes the fossil's beauty.

After three days of rock hunting, even my eyelashes hurt. I was like the rusted Tin Man all over.

The next morning, I felt great.

Spent some time with one of my bestest friends, Mary T. Kincaid, (she writes books for children).

While  teaching her some online genealogy tool tricks we discovered WE MIGHT BE COUSINS through MY BRADY LINE!

Aaah...sweet balance.

GEDmatch, Spreadsheets, and Mac Users

Thank you Tami Murphy for this information. 

Gedmatch Copying Test Results to Spreadsheets for Mac Users.

To select all and copy on triangulation:

1.  Select all use "flower/command"-A

2.  Copy use "flower/command"-C

     In your spreadsheet to:
1.  Paste use "flower/command"-V
2. Save

Happy Finding!

Monday, August 14, 2017

GEDmatch Tool: Gedcom + DNA Matches

A gedcom is a software tool that allows a person to build, save, and share family trees. There are loads of free gedcom software online you can download to your computer.

Before I added this information I used Excel to create a single DNA Workbook using Gedmatch Tier 1 tools which I keep on my desktop. Within the workbook I have downloaded on separate sheets: Tier 1 Beta Graphic Tree, Graphic Bar Chart, CSV file, Triangulated Segments and Matching Segments. I recently added a sheet for Gedcom + DNA Matches. I have two other people I have shared this method with who are also getting great results.

I recommend this for everyone; especially people who are adopted and looking for biological family. If you are building a Mirror Tree, it all starts with finding your most recent common ancestors and this works.

GEDmatch: Gedcom + DNA Matches

An often overlooked tool on GEDmatch is the Gedcom + DNA. You will find it on your landing page.

When you enter your kit number it will bring up everyone who is a DNA match to you and has a tree on GEDmatch. Yes, you can view these people on your one-to-many page, however, sometimes it's nice to have a separate page just for gedcom matches in a spreadsheet in your workbook. Add a column in the spreadsheet for notes. It also gives you a ready place to find all gedcom user numbers. (Recommended)


To find gecom ID numbers; enter the kit number in User Look Up which is also on your landing page.

You can enter any two gedcom ID numbers (not kit numbers) into the 2 GEDCOMs tool and it will search both trees for you.  (This tool is what made GEDmatch so popular in the first place.) No more crossed eyes from studying trees.

Click on 2 Gedcoms to open this window. Enter gedcom numbers and click Compare.

This tool comes up with the same, or similar names, and you review the information to decide if these are a match. You don't have to click on anything else unless you are certain you want to confirm the match. (Hint: if you get similar names in the same geographic area and time frame, and with no parents listed, these could be siblings or cousins. If they have the same parents...BINGO!)

Added Power in GEDmatch

Compare gedcoms in your Gedcom + DNA list with trees in your Triangulated Graphic Tree in Tier 1 Beta tools.  They are the matches who have a little green tree in the rectangle. Bold all of those matches that are in your Gedcom + DNA who are in your Triangulated Graphic Tree. 

Kit number at top of rectangle. Green tree indicates a tree associated with kit. If you are live on Tier 1 you can click on tree and review. You need gedcom number to do a compare. (See above to look them up.)

Some of the DNA matches you have in the Gedcom + DNA list may not have had enough DNA show up in your triangulated groups; therefore you need to compare the Gedcom + DNA that are not bolded against gecoms of people in your triangulated groups. 

Even though their segments may be smaller, if three not too closely related people, share the same position, on the same chromosome and have the same common ancestor in their tree, it makes a triangulated group.

AND, if another person shares that same ancestor, but in a different location on a different chromosome, it adds another layer of verification for that shared common ancestor.
You need at least three people (you count as one of them) to verify the common ancestor on a different chromosome. IMPORTANT!  This piece of DNA in a different location could be a different common ancestor AND THIS COMMON ANCESTOR WILL BE FROM THE SAME LINE OF ASCENT OR DESCENT FOR YOU.
For adoptees, you are actually doing "reverse" tree building. You will use the triangulated Most Recent Common Ancestor (MRCA) to find the MRCA you are looking for and following the branches down to you.

Successful finding!
(I consider blog shares a genealogical blessing.)

Wednesday, August 9, 2017

Adoptees: 6 Mirror Tree Helper Tools

For those adoptees who are building Mirror Trees there are a few tools that can make your task much easier.

1. A gedcom program. This is a computer program for building family trees. Having a gedcom program allows you to construct a tree or parts of a tree with ease. With most programs you can attach and detach tree branches and save time and keystrokes. (You can save branches that don't appear to be your closest in a separate folder and after you have found your family, re-attach them if they are part of your tree.)

There are many free gedcom programs available online.

The program I have the most experience with is Legacy Family Tree. There is a learning curve. Legacy has superb training videos. If you can afford it, I would go ahead and purchase the Delux program.  Price-Free and up to $99. (Legacy is on half price sale at the time of this post 8/9/2017) HERE

2.  Learn and use Rootsweb WorldConnect. This site is an oldie but goodie; launched in 1999, you can read a brief history of those who created it HERE.

Genealogists make mistakes, (I certainly do). Unfortunately, many of the those posted their trees to RootsWebWorldConnect and never made any corrections. Some of these amateur genealogists appeared to make a contest of building trees as big as they could as fast as they could. They used one of Rootsweb's most innovative features; the ability to download gedcoms and link them together. Many of the gedcoms were not adequately sourced. This created many errors being repeated and re-posted. Many people have uploaded parts of these error filled trees to other genealogy sites; including AncestryDNA trees.

Still, Rootsweb is an awesome tool for expanding family trees you share with matches on AncestryDNA. If you have linked your Mirror Tree to one child's line, you may need to find another child from this line before you start getting leaf hints. If your match only shows one person, look for family members at Rootsweb. (Use the surname and geographic location but give a 10-20 year span on birth date to find possible siblings to your match on Ancestry.) Rootsweb link HERE

The use of DNA to find and correct errors on Rootsweb, is slowly having positive effects on public online trees, thanks in no small part to adoptees using the Mirror Tree method to find family. As an adoptee, if you discover such an error, please relate this information to your match. You will benefit genealogists and all those adoptees using Mirror Trees in the future. Use Rootsweb for CLUES. Take the information based on your common ancestor match on Ancestry and look up to expand family members. Armed with this information go to--

3. Join (free) WikiTree and enter your profile. Then one profile at a time, grow your tree DOWN using your suspected common ancestor you find Ancestry who is also on WikiTree. For someone who is not adopted How-to video HERE. Each profile has a link to find sources specific to the information in the ancestor profile. Your DNA, once linked to a GEDmatches DNA, verifies you are on the right path.

4. Everyone should download relationship charts. There is one, The Shared cM Project, designed by Blaine T. Bettinger; another one created by Christa Stalcup, DNA Detectives Autosomal Statistics Chart, for the DNA Detectives. (see my May 5, 2017 post for Blain's chart.) Christa's chart is HERE

I recommend having these charts laminated. Most office supply stores or libraries will do this for a nominal cost. It will help keep the charts from getting lost if you are also a paper-note-taker like I am.

5. If you have one side of your tree identified, fill out an X DNA Inheritance Chart and keep it handy. With permission from Blaine T. Bettinger, Debby Parker has attached a Creative Commons license and has linked several different electronic formats of the charts for use in compliance with the creative commons license. You can download and personalize the charts that are available by clicking: HERE.

6.  Use GEDmatch Tier 1 Tools for one month. This will cost you a one time $10 donation. Download all of the Beta tools as indicated by the red arrows in this screenshot into a single workbook. You can make it a single workbook by opening different sheets indicated at the bottom of an open spreadsheet. Here is a video on how to download DNA data to Gedmatch HERE.

I prefer the Tier 1 tools in a workbook spreadsheet for myself in this order starting with Beta Triangulation Groups: Sheet 1- Graphic Tree, Sheet 2- Bar Chart Graphic, Sheet 3- CSV file, Sheet 4- Triangulation (it takes the longest to run and I title it Triangulated Segments) Sheet 5-Matching Segment Search. With each results run  simply do a Ctrl-A to copy then open the spreadsheet page and paste. (Full instructions are found in my post Easy Peasy Spreadsheets.)

Write emails to the people you triangulate with. Send them a copy of your one-to-one comparison, or send them a screenshot of who you match with in the graphic tree or Triangulated segments. 

On Sheet 5, Matching segments I add a column in the spreadsheet just before the black bordered color graphic. This extra column is for my notes, most recent common ancestor (MRCA) and who triangulates with me that helped ID the MRCA.

If you suddenly have many new closer matches on Gedmatch, you might want to donate again and download a new workbook or at least the Triangulations page in your workbook. Then transfer all your common info from your previously identified matches in your matching segment sheets. I am told I wouldn't have to do all this sorting and adding if I use Genomate Pro. (Big learning curve for me.) Maybe when I have a chance I will try it; but for now I am struggling to keep up with the emails I am exchanging with others and adding our MRCA's.

A note here on MRCA. The most recent common ancestor is the closest person you SHARE. It may be a couple. You come from one of their children's lines, if your match comes from a different child's line; you share the common set of grandparents. Include both surnames in the column. If one of the grandparents had a second spouse and the child's line who you match came from that different spouse, you will be able to identify your MRCA as the one grandparent you have in common. Common ancestors (CA) is everyone one else in the more distant straight line, up the tree, who you share with your match. This drawing is an example of a MRCA:

If you use the tools I have listed in this blog post, it will help you find your MRCA's.  Using AncestryDNA for Mirror Tree's finds common ancestors. Triangulated groups will help you find your MRCA's. Finding MRCA instead of CA's will help you find the right biological family with more accuracy. So, look for your closest match on Gedmatch who shares the most DNA with you and see if you triangulate with them. Then start building your Mirror Tree down each child's leg or branch of the tree. If you don't get wiggly leaf hints, start again with the MRCA and build down a different child's branch.

Happy finding!

Do You Manage DNA Kits for Multiple People?

This post will give you a clue about how I blunder around. I write people emails; often sticking to a prepared message. Sometimes I get responses and sometimes I don't. I have told people I think some of my matches have a "Do Not Respond" gene floating around. Fortunately, for my genealogy pursuits, I don't. 

Then there are those who do respond who are open and eager and they may think I am nuts. That's okay; I am who I am.  I share, often bouncing from one train of thought to another. I let them know me. Hey, they are related, they are family.

Today, I wrote just such a message. The only change I have made is to remove one living person's name (and some glaring type-o's). The name I removed is another person I have communicated with who triangulates with the recipient of this email. All other surnames are part of our important communication to find our common ancestor, or to address something my relative shared with me in our communication. Here is that email:

The other person who triangulates with us is at a loss, as her father was adopted and she is trying to discover her father's line. Once we figure it out, I will be able to tell her who it is and she can do a form of "reverse" genealogy called a Mirror Tree to find her father's family. 
It isn't unusual NOT to have a DNA match at 3rd cousin and more distant. In fact, it is astounding that it happens. It all has to do with how the DNA is recombined in each person that makes us unique. That tiny segment we share in the same place, on this same chromosome which links us to our shared common ancestor to me is very special; it links us through time and history. It is our window through which we can focus on that particular ancestor. Like a message in a bottle. I want to know what that message is telling me. That is at the root of this passion I have--- genetic genealogy. 
I would love to look at your full tree. I noticed the name Caudill in the screenshot you sent. Funny, I have been running into that name more and more in my searches. As we progress further and further back in history we may find we have more than one common ancestor. I have a friend at my local library; when I saw all the surnames we share (I keep finding the same names in searches), I immediately told her we would find we were related and probably with more than one ancestor. We have found three so far (though not genetically.)

As for the Edwards surname; many people have researched John Jenkins wife as Mary Ann McPhearson. There were two John Jenkins in Butler County, KY. Both had wives named Mary Ann. Only one had a daughter named Vilet (yep, they left the o out,). That is Mary Ann Edwards and she is the mother of my 2nd great grandmother Lucinda Jenkins who married Robert Armstrong. It appears we may need to focus on this Jenkins line; I am still curious about the Caudill surname. I have also come across the Workman surname as well as Hawkins and Gist. But hey, I study MANY trees.

Have you run the test on GEDmatch: Are your parents related? Sometimes that can give you a clue beyond what the written results indicate if you look at it in graphic mode as well. You might see a tiny blue line which indicates a common ancestor.
Jim Bartlett's blog, Segment-ology (when read, starting with his first post) helped me understand how triangulation works better than anything else other people have written.

BTW, you can download your tree from ancestry to your desktop; make notes of the "evidence" you have in that line because if you got the source info from them you will have to find it from other sources (for free) it's out there. (I recommend you do this since Ancestry has just been purchased by another company.) You can get a free gedcom program on line if you need one. I recommend Legacy. 
It would be a great leap forward if you donate one time to GEDmatch Tier 1 tools for a month. That will provide ample time to download all of your results from all of the kits you manage into separate workbooks in Excel for each person. You will be able to see who triangulates where, on which chromosomes. I use my Matching Segments page; add a column right before the graphic where I can enter info about common ancestors discovered using the triangulation tools.  
If you read Jim Bartlett's blog and download a workbook for each person, I promise a light will come on and you will jump way ahead of others. To better understand what you are seeing, I have provided some explanations in my blog: The Blundering DNA Genealogists. (I gave it that title, because that's how I have learned, by blundering around and using the tools and trying to figure out what they mean.) Now I am blessed to be able to teach people this method at my local library. 
I also highly recommend building your tree on WikiTree. And though there is a learning curve, I also caution against using a gedcom to upload your tree. By building one person at a time, you will discover cousins as you build and link to this collaborative one ancestor profile entry tree. (We do our best not to duplicate the same ancestor, but link ourselves and others to that ancestor). When you include your GEDmatch kit number, it will automatically populate those profiles with whom you and others share DNA. You will know you have the correct ancestor as soon as three people triangulate with this ancestor. Finding a third person can take awhile; triangulated groups help if you can get others to join WikiTree who triangulate on GEDmatch. 
Whew! Long winded me. I look forward to an invite to view your tree. (Please include a maiden name for your grandmother's line) 
Cousin somehow---we WILL figure this out,
Barbara Shoff 

Thursday, July 20, 2017

GEDmatch: When The Light Goes On

As my blog title indicates, I often blunder.

Yesterday I realized I missed an important aspect of the GEDmatch tool:

People Who Share on One or Two of Both Kits

(It may even be the reason it was designed in the first place, and I totally missed it.)

Blaine T. Bettinger often reminds us, we have two trees. Our genealogical tree and our genetic tree. I quote him often when explaining why cousins don't all share matches. (It has to do with recombination and only so much genetic material can be handed down through the generations thus squeezing other DNA out.)

I have a friend who works at the local library and it really bothered me we share so many surnames in the same regions of the country, in the same time frames, but we don't share DNA.

That dimmer switch turned up the light bulb that floats over my head.

We had to share someone. But if I didn't get that little bit that connects us, who might?

I ran People Who Share on One or Two of Both Kits. The result was a list of about fifteen people who share DNA with both of us. They are our link to finding our common ancestor. I have not written them yet. It will be interesting to find out if we share one, or possibly more common ancestors.

Happy finding!

Monday, July 17, 2017

1 Simple Thing You Can Do Could Help Hundreds of Adoptees

Most of us have seen the joyful, tear-jerking stories of reunited biological families. Many of them are advertisements from various DNA testing companies. You could be the one person who makes a big difference.

And you can help without having your own DNA tested and do it in one evening. Please go to the FREE online WikiTree site and build a tree. It doesn’t have to be very big. Enter yourself, your parents, and your grandparents. It would be wonderful if you can enter profiles of your great-grandparents too. And absolutely fabulous if you can go back one more generation to your 2nd great-grandparents.  (All living relatives’ names and information automatically remain private.)

Be sure to enter when and where they lived and died (if you know, if not, give estimates). If you have challenges, after you enter the information you do have, there will be a research link on the lower right of each profile page for each relative you have entered. Click on it and you can find more information about your family.

I do need to warn you, you may bump into a cousin you never knew you had, especially if you go much beyond your 2nd great grandparents.


First, please add at least your first three generations to WikiTree. More if you have it. (I have discovered genealogy blessings always bless you back--often very quickly!) If you have a brick wall, try posting about it in the G2G forum, to find, click under the help bar upper right. The volunteers at WikiTree are awesome when it comes to helping you solve mysteries.

Second, PLEASE, PLEASE, PLEASE upload your raw data from your testing company to the FREE genealogy tools site GEDmatch. It is easy and takes only minutes to do. You will be amazed at the family you will find. The tools there have helped me make matches every time I use them. Below you will find a link to GEDmatch Basics. Instructions for uploading start at the 7 minute mark.

Get Started on WikiTree, click here.

Learn how to upload to Gedmatch click here.

I want to thank Nadine Daszkiewicz for encouraging me to write this post and everyone else at the DNA Detectives Facebook page for sharing their stories with me. May this post bless you all.

Monday, June 26, 2017

Get Started on WikiTree Today!

For anyone doing DNA triangulated groups and segment studies who want to find the best tools to verify their paper trail, WikiTree is a must.

Yes, there is a learning curve. If this Blundering Genealogist can do it, so can you.

You can do a partial or full tree on WikiTree and add your GEDmatch number in order to verify your paper trail. Be prepared; you may discover surprises.

It has been my experience as I work with other people and teach them the wonders of WikiTree, you won't be alone for long. Often by the time you enter your second great-grandparents you will start finding cousins (especially if you live in the United States).

That is why I suggest single entries rather than uploading a gedcom. Often adding a gedcom only creates more work. Especially if many of your family members already have profiles.

In the lower right hand corner of the profiles you enter (in profile view, not in edit view), you will find a Research tool. Use it. This link gives you resources with a click of the button. (You will need to re-sign-in .)

Some people have challenges using a collaborative tree. You can set your privacy so others can't change your data. If your data is questioned don't be offended. Other genealogists are trying to help or they may need help. This is your opportunity to collaborate with others to explain why your information is correct. And yes, I have had to swallow my pride more than once and accept when I had mis-information. I am thankful, because I would rather leave a tree to my family and the world that is right and verified by not only paper sources, but DNA as well.

Go for it! Have some fun and try it out. You will be glad you did.

Happy Finding! To get started: Click HERE.

Friday, June 2, 2017

Gedmatch Tool: Genesis

If you are new to DNA and genealogy---Don't worry if you don't "get-it" yet, I just wanted to let people know Gedmatch has added another tool to their arsenal.

Late last night while surfing my numerous Facebook genealogy groups, I happened across a post about a new tool. How had I missed it? I had been working on Gedmatch all day!

I went to Gedmatch and immediately found what everyone was discussing but couldn't figure out.
When I opened the tool this is what I read: 
The Genesis Algorithm

"For several years, GEDmatch has provided genetic genealogists, both beginners and experts, the ability to search for matches among kits in their database without regard to vendor. Also, GEDmatch has provided a rich suite of analysis programs allowing users to dig deeply into the genetic details of their matches, enhance the reports from their vendors, and even pursue their own original research ideas. Our algorithms are evolving to extract the most trustworthy and meaningful matching information possible using the markers common to pairs of kits even though sometimes limited.

Unfortunately, all too often, kits appear to share a DNA segment purely by chance. To combat this confusing phenomenon, we recently have developed a reliability measure that allows users to assess the quality of a matching segment in an intuitively appealing fashion. We also use the measure to guide our matching algorithms as they wring the greatest amount of useful information possible from the markers common to pairs of kits.

If we could assume that marker characteristics were uniform in all regions within chromosomes, we could use a "one size fits all" requirement for matching segments as is sometimes done. Unfortunately, the relevant characteristics vary widely. Some long segments with few markers may be accidental matches. Some marker rich short segments are often discarded although they are profoundly non-random.

Using the characteristics of each and every marker in a segment, we compute the expected number of purely chance matches to it to be found in the database. That number is then used to classify the segment into one of several levels reflecting the likelihood that the random matches may overwhelm the real ones. When a user executes a one-to-many search or a one-to-one comparison specifying a minimum segment length, the display can then include an estimate of validity for each segment found.

One can assume those segments designated to be valid are the result of a DNA inheritance process rather than mere chance. Questions may still remain about how far back shared DNA originates, but a confounding factor has been removed."
An earlier version of this tool was once part of the One-to-One comparison on the free side of the Gedmatch site. It was often overlooked, because people didn't understand it's value. And, it is a valuable tool.

Now, with more people doing triangulated groups, and the growing understanding of identical by descent (IBD-you share a common ancestor) and identical by state or chance (IBS or IBC-false positives) more genealogists are looking closely at the chromosomes of their matches to determine if they are indeed IBD matches.

What you need to know:

1. You need to be a Tier 1 Member ($10) donation for a month of access to Tier 1 tools. Tier 1 provides a wonderful assortment of automated genealogy tools that can save a researcher hours of tedious work.

2. You have to upload your raw data to Genesis because it is on a separate server. You will get an additional Gedmatch kit number specific for Genesis.

What you see:

Select All DNA Matches - you see a match list for everyone who matches you who has uploaded to Genesis, their kit number, user name and contact information. (Like the L button on your regular Gedmatch One-to-Many Page)

You can use Ctl-F, enter your kit number, and find the different people with whom you share DNA. By studying their list of matches you might recognize someone with whom you have already made a connection.

One-to-Many--gives you a list of all the people you match and the information as shown in this header.

As on your regular Gedmatch One-to-Many page, click on the "A" between your matches kit number and their name, and you get a 1:1 comparison of chromosomes 1-22 complete with color graphics. The heading on the page explains how to "read" what you see.

As you scroll though the chromosomes of the person whose DNA you are comparing, you want to see solid green over blue to validate base pairs with a true match.

If you use the Validity Tool and enter your kit against your kit, you will get solid green over solid blue. You match yourself perfectly.

If you compare yourself against a parent, sibling, grandparent or first to second cousins you will find significant segments of solid green over blue in many places.

Areas of yellow over blue denotes a half match; a possible match to either your maternal or paternal line.

You will only know which side they are on by comparing genealogy. (Unless you have done something called Phasing--a whole other post. In this case you will get lavender.)

To verify a common ancestor, especially with smaller segment sizes, you will still need to triangulate with another cousin. You may find that cousin to triangulate with in the results you collected from your Tier 1 Matching Segments tool.

I appreciate the visuals. They help me see exactly where and how I match with others.

Thanks Gedmatch!

Wednesday, May 31, 2017

Tier 1 Gedmatch Matching Segment Search

The tool “Matching Segment Search” on Tier 1 tools loses some of its visual clarity during the process of copying and pasting into a spreadsheet. You get a better visual understanding by being a Tier 1 member. The developers have done a great job to compensate by using color coding to help identify possible match groups on each chromosome.
When the color on the column changes, it indicates a different group of matches who potentially  share a different common ancestor. (This is due to something called recombination. You can learn more about recombination HERE.
This workbook sheet presents matches in order, beginning with chromosome 1 through chromosome 22.

When viewing on the Gedmatch website you see a variation in size of the shared segment on a chromosome. Below, everyone listed in the purple group, match on at least some of the same position on the same chromosome. This visual shows some people share more of this segment with you than others. The worksheet  includes the segment size that is shared. Though not an actual triangulated group, those who show the same color indicate they hold the potential to be a triangulated group.

The picture below is what you see in your copied and pasted workbook spreadsheet. Instead of the narrower and wider graphic, a  big block of the same color indicates you share at least part of common area on this chromosome with everyone else listed with that same color; and thus, the same common ancestor. (There are times you could share this same color simply by accident.) That is why it is important to discover your common ancestor with people who share segments over 15 cM first. (Email them to compare trees.)
The header on Matching Segment Search titles all the pertinent contact information, and the segment start and end location and the size of the segment you share.
As you study your Matching Segment Search page you will also notice a change in the color in the Segments column when you begin a new chromosome.
If you share on more than one chromosome with a match, don't assume the match is for the same common ancestor. It could indicate a different common ancestor. For instance one match may be for a common grandfather, the other match could be for a common grandmother. Or, it might even be for the parent of a common grandparent. You will have to find out who others in the triangulated group share by studying their genealogical trees.
(If you have an adopted person in your group, you can greatly assist them by notifying them of the common ancestor they share with you and others in the group.)

When studying segments think of a triangulated group as you would a three legged table. The table top is the common ancestor; the legs represent descendant lines through three different children.

Let’s use Hugh Brady b. 1709 as an example. I discovered I match with a descendant from his daughter, Mary; and a descendant from his son, Ebenezer on the same chromosome and segment. Together we are a triangulated group. Our most recent common ancestor (MRCA) is Hugh Brady. Hugh is our common link. Everyone else who shares this same segment/color grouping on the same chromosome should also  have this same Hugh Brady in their tree. This segment of DNA can be identified, Hugh Brady b. 1709.
If your testing company is AncestryDNA, you may have noticed there are times when your ancestor hint you share with a match provides more than one ancestor with whom you share your DNA. This could be because someone doesn't have their tree filled in correctly. OR, it could mean you need a third person to triangulate with, to determine who your common ancestor actually is. There has to be at least 3 people, not too closely related to have a triangulated group.
On the Matching Segment Search you can have more than three people in your triangulated group (same color, same chromosome, share somewhere on the same segment) and their genealogical trees should all include the same common ancestor.
Email them to find out who it is.
Hint: To more quickly identify your shared segments to a specific surname in your tree; do a surname search on your testing company's matches page. Try to find descendants from different lines where you have a common set of ggg (or more distant) grandparents. Use matches beyond second cousin range. Get their Gedmatch Kit Number. Do a one-to-one match on Gedmatch and identify the chromosome where they match you. Find them on your Matching Segment Search page.  Email the other people who are in the same color group. Check their tree and confirm the same common ancestor. Insert a column in your spreadsheet and write the name of your common ancestor for this color group. Now, when a new match appears, and matches you in the same location, you instantly know who your CA is  by looking on your Matching Segment Search page.

Happy Finding!