DNA - When Cousins Marry: Pedigree Collapse vs Endogamy

When cousins marry, it can create confusion when looking at DNA centimorgans and your genetic relationships. In this episode we explore the differences between Pedigree Collapse and Endogamy in your DNA results. This is an interview with guest Diahan Southard. Learn how to spot Pedigree Collapse in your own family tree.

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TIMING
0:00 Intro
1:19 Genetic Genealogist Diahan Southard
1:46 Pedigree Collapse vs. Endogamy
3:45 DNA and Recent Common Ancestors
3:59 What is Endogamy?
4:28 Recognizing endogamy in DNA matches
6:06 Geography and Endogamy
7:00 23andMe, Ancestry, MyHeritage DNA Algorithms for endogamous groups
8:01 FamilyTree DNA for endogamous groups
8:28 Ancestry.com - Timber
8:54 Identical by State vs Identical by Descent
9:40 The Timber Algorithm - how it cuts down your matches
10:37 Example: Diahan’s Grandmother
13:11 When endogamy gets in the way
13:40 MyHeritage Chromosome Browser
14:38 Small Town Endogamy
15:16 Can we find out who the DNA comes from?
15:45 What kind of DNA to look for
16:35 Your DNA Guide
17:32 Is pedigree collapse easier to solve?
17:53 Multiple relationships
18:17 How many events?
19:02 Who will see pedigree collapse?
19:41 What 2 relationships do these cousins have?
21:04 Calculating expected shared DNA
21:53 Using the Shared Centimorgan Project
22:30 Looking for Biological Parents
23:20 Exploring all possibilities
24:43 Using DNA to rule out endogamy
26:47 YourDnaGuide.com
27:00 Free downloads
27:42 Follow Diahan's Work
28:14 You can do DNA
28:36 Research matters
28:58 Handout
29:19 Outro

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I am a fanatic for genealogy, family history and DNA to research my American ancestors . I am a professional genealogist; I teach research skills and records research. The best videos on “Genealogy TV” (YouTube) are about learning research notes, logs, staying organized, genetic genealogy, finding missing ancestors, and where to find family history records. Learn genealogy for free and how to research on Ancestry.com, FamilySearch.org, MyHeritage.com, FindMyPast.com, FamilyTreeDNA, AncestryDNA, 23andMe, Wiki Tree, Geni, National Genealogical Society, National Archives, State Archives, local family history rooms, genealogical and historical societies genealogybank.com, Chronicling America, Newspapers.com, Newspaper Archives.com, Fold3, Archive.org, Internet Archive, Wayback Machine, Digital Public Libraries, National Archives, Google, Google Books, Google News, Facebook for genealogy groups, and the very best genealogy websites and resources.

Other YouTubers are The History Guy, Ancestral Findings, Family History Fanatics, Geneavlogger, Legacy Tree Genealogy, Genealogy TV (of course), Ancestry, FamilySearch, Useful Charts, Dear Myrtle, and 23andMe.

Music Credits for Song on Word Tree Open
Circus Waltz Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
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