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RLP 228: The Effect of Pedigree Collapse on DNA Matching: A Case Study

The Research Like a Pro Genealogy Podcast

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The Shared Son of Morgan Project and Pedigree Collapse

With multiple relationships, you can use the strategy to estimate the expected amount of shared DNA. So with Joseph and Glenn's child sharing 239 centimorgans, it seems closer to the 224 average of the half first cousin once removed relationship. But this strategy is not one you can use for pedigree collapse or endogamy. And after reviewing Joseph's pedigree further, we see that his great grandparents were Robert Daniel and Edda Hopper. They were first cousins who got married to each other. This results in pedigree collapse in Joseph's tree.

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