Have you ever suspected that endogamy was affecting your DNA analysis? You might notice a large number of matches from an island population or isolated area. The matches might seem to share a lot of DNA but no common ancestor can be determined. Clustering matches doesn’t seem to produce clusters...
Steve Little, one of our Research Like a Pro with DNA 4 Study Group members, wrote this guest blog post about how he uses diagrams to help visualize the multiple relationships with his DNA matches. He is from a community of mild endogamy — Appalachia. I hope his insights will...
Today’s episode of Research Like a Pro is about pedigree collapse and its effect on DNA matching. We discuss the coefficient of relationship calculation and how that can help you estimate the expected amount of DNA two people should share based on the relationship in their trees. We talk about...
Pedigree collapse occurs in a person’s family tree if one of their ancestral couples are related to each other. This causes the same ancestors to be repeated in their tree. For example, if a person’s parents are second cousins through their great-grandparents Joseph Dyer and Anna Smith, then Joseph Dyer...
Today’s episode of Research Like a Pro is about double cousins. Do you have any? We’ll talk about how double cousins and other relatives with whom you share multiple relationships can affect DNA match analysis and genetic network analysis. Although double 3rd cousins don’t always share an inflated amount...
Today’s episode of Research Like a Pro is about the difference between endogamy, pedigree collapse, and multiple relationships. We discuss examples of each scenario and how it affects DNA matching and cluster analysis. Transcript Links Endogamy, Pedigree Collapse, and Multiple Relationships: What’s the Difference and Why Does it Matter?...
I am sure I am not alone in finding that I constantly have more to learn when it comes to using DNA in my genealogy research. For example, I have defined many situations in my DNA research as pedigree collapse. However, after reading Diana’s post Endogamy, Pedigree Collapse, and Multiple...
Do you have DNA matches that seem to belong in multiple genetic networks? Are you nervous that you’re seeing pedigree collapse or endogamy? Before you despair, realize that this phenomenon could be due to DNA matches sharing more than one common ancestral couple with each other, or what’s often called...
You may have heard the terms endogamy, pedigree collapse, or multiple relationships as you’ve been learning how to use DNA with genealogy. What does your match list look like if you have any of these scenarios? What do your cluster results look like? How do you work with those DNA...
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