Repost: Blaine Bettinger's Shared cM Chart (Helpful for AncestryDNA Users)

I posted this updated shared cM chart from Blaine Bettinger recently, but it is so useful I'll post it again!

One of my most viewed posts last year was about version 2.0 of Blaine Bettinger's Shared cM Project. When I went over to the Autosomal DNA statistics at the ISOGG wiki I was pleased to see he had updated his chart.



© 2018 Copyright, Christine Manczuk, All Rights Reserved.

A Helpful DNA Relationship Chart (Especially for AncestryDNA Users) - Shared cM Project Chart, Version 3.0

Blaine Bettinger's "Shared cM Project - Version 3.0."  

One of my most viewed posts last year was about version 2.0 of Blaine Bettinger's Shared cM Project. When I went over to the Autosomal DNA statistics at the ISOGG wiki I was pleased to see he had updated his chart.


© 2018 Copyright, Christine Manczuk, All Rights Reserved.

Fantastic Find: Blaine Bettinger Has Updated His "Shared cM Project" Chart

Blaine Bettinger's new chart.  See the entire article at the ISOGG site here.

After attending the genetic genealogy conference last year I learned to use the Shared cM Project chart to navigate my DNA matches at Ancestry.  I used my parents as examples of how to find the amount shared, but you can use it for any DNA match to get a ballpark idea of how they might be related to you.

I highly recommend keeping this chart handy if you are trying to analyze your DNA matches.



© 2017 Copyright, Christine Manczuk, All Rights Reserved.

A Helpful DNA Relationship Chart (Especially for AncestryDNA Users) - Shared cM Project Chart

Blaine Bettinger's shared cM chart available at the Autosomal DNA Statistics page of the International Society of Genetic Genealogy Wiki.  I use this all the time when I am analyzing my AncestryDNA matches.

Although AncestryDNA refuses to offer a chromosome browser, they do offer some helpful bits of information.  You can't see where you share DNA with any given cousin match, but you can see the total cM shared and how many segments shared.

A typical scenario: no tree, no chromosome browser, but at least I can see that Ancestry is confident of this match and it tells me how much DNA is estimated to be shared.  AncestryDNA estimated 4th cousin (avg 31 cM shared according to chart above), but it could be anything from a 1st cousin 2x's removed to a 4th cousin 1x's removed, but too much for a 5th cousin (unless there are other people you share that you don't know about).

This chart is very helpful to immediately determine a likely set of possible relationships.  I like that it includes both the average amount shared as well as includes the range of possible shared cM.



© 2017 Copyright, Christine Manczuk, All Rights Reserved.