In this genealogy tutorial I go over different tricks and tips to help those conducting genetic genealogy for Jewish ancestry. Many people with Jewish ancestry have a lot of difficulty with their DNA test results and identifying significant genetic matches. While the largest hurdle in Jewish genealogy is just the lack of documentation going back in time, Jewish genetic genealogy also has the hurdle of endogamy. Endogamy is defined as the custom of marrying only within the limits of a local community, clan, or tribe. While incest is a form of endogamy it doesn't mean just incest, it is often just being a cousin to someone in a few ways through different lines.
The way to overcome endogamy and locate significant matches . is by focusing on the number of segments and/or the largest shared segment. The reason for this deals with genetic inheritance and the recombination of DNA with each generation. The further away of a relation someone is then you can expect smaller amounts of shared DNA because each generation only inherits part of the DNA after recombination. So if a match is an endogamous relation who looks like a 3rd cousin in shared cM but is actually much more distant of a relative, in a few ways, then we would expect them to have more segments at smaller sizes than a true 3rd cousin. There are two methods to apply this and identify significant matches, but which method you use depends on the website where your test is located. The first method is the largest segment method where you just look at matches by the largest shared segment, focusing on large segments over 20 cM. The second method is the ratio method, where you use a ratio of 'total shared cM:# of segments' at a number of 10:1 or better.
Ancestry DNA - Ratio Method
23andMe - Ratio Method
Family Tree DNA - Largest Segment Method
MyHeritage DNA - Ratio Method or Largest Segment Method
Gedmatch - Largest Segment Method
Once significant matches have been identified, then the hard work begins to figure out HOW they are are related. You'll want to work to build their family tree, even if one isn't provided with their DNA match results. To figure out which lines you are related through you can use the x-chromosome inheritance or by looking at shared matches. As the family tree is being built you will want to look for similarities in surnames or locations.
Check out these other videos to see how these are applied in real cases;
* DNA and Immigration Records - https://youtu.be/2h6zplRuD28
* Confirming Genetic Genealogy - https://youtu.be/sD2IIOpHM4s
* Kiev Genealogy using DNA - https://youtu.be/n3cqciU14qs
Read my blog "Sephardic Genealogy"
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Genetic Genealogy for Jewish Ancestry and Overcoming Endogamy in DNA - Genealogy Tutorials
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* The Family Tree Guide to DNA Testing and Genetic Genealogy by Blaine T. Bettinger - https://amzn.to/2uYNc3o
* Genetic Genealogy in Practice by Blaine T. Bettinger and Debbie Parker Wayne - https://amzn.to/2OkWSxb
* From Generation to Generation: How to Trace Your Jewish Genealogy and Family History by Arthur Kurzweil - https://amzn.to/2AjD3mQ
* Genealogy Standards by the Board for Certification of Genealogists -
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