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African American DNA Research Forum

Re: Pedigree Collapse in African's
In Response To: Pedigree Collapse in African's ()

I posted a reply before and need to add to it:

>If one person appears in your chart multiple times,
>that person represents a higher percentage of your
>total ancestry than would otherwise be the case.

I need to add that this person would need to appear in your chart multiple times as a direct ancestor for this to be true.

Here's an example of "pedigree collapse" I know of:
A married couple I know grew up in the same town, attended school together, and have been married long enough to have grandchildren. They got into genealogy seriously in the last few years and discovered that they have the same great-great grandfather.

That man represents a double dose of ancestry to their children because he's mother's great-great grandfather and father's great-great grandfather. One person where theoretically there would be two different people. And the more generations you go back the more overlap you will find, especially in areas of small populations.

A friend told me he had to look in a different county to marry someone who wasn't a relative. And who knows, maybe he didn't look far enough away. :-)


18 Dec 2002 :: 14 Nov 2008
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