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African American DNA Research Forum

Number of Markers-How Many Generations

I have given much thought to the dialogue about how far back an ancestor from a specific group might be from the present generation.

Family Tree DNA offers testing at different levels. When comparing one's results to another when there are matches, the question arises, how far back is that common ancestor that they have?

On one of the pages on the Family Tree DNA page, it states:

"The basic idea is simple: Individuals that match at a higher fraction of markers are more closely related."

On that same page, is a chart showing the number of generations and the number of generations any two people with high resolution markers are likely to be.

There is a 50% probability on the chart for example that shows that even there might be a connection within 7 generations of having a common ancestor with another who has the same markers.

The usefulness of some of the tests that illustrate the markers, might be particularly valuable when persons were separated as were families during the years of enslavement.


18 Dec 2002 :: 14 Nov 2008
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