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African American DNA Research Forum

Re: DNA Diagram
In Response To: DNA Diagram ()

This is a follow-up thought to Mel's diagram and Toot's example of the "testing funnel" to show the individuals being traced in your Y & mtDNA testing.

Look at your ancestor chart with you being person #1, track as many generations of your ancestry as you care to, but for this example we'll go just 6 generations.

The ancestors/people/#'s traced for your Y-DNA are 1, 2, 4, 8, 16 & 32. They are (1) you, (2) father, (4) grandfather, (8) great-grandfather, (16) great-great grandfather & (32) great-great-great grandfather.

The ancestors/people/#'s traced for you mtDNA are 1, 3, 7, 15, 31 & 63. They are (1) you, (3) mother, (7) grandmother, (15) great-grandmother, (31) great-great grandmother & (63)great-great-great grandmother.

This follows the very top line of the ancestor chart (paternal) and the very bottom line (maternal) .....hence Toot's tunnel example. Your ancestry following the missing numbers between 1 & 63 is not included in these tests.

The BGA, or Admixture Test, giving %'s of ancestral ethnic origin reports to include the DNA contributions of ALL ancestors/people/#'s in this 6 generation ancestral chart.

Another thought on matches.....Y & mtDNA report probabilites by the number of markers tested....smaller number of markers, less probability of finding MCRA (most common recent ancestor). This can be in terms of thousands of years, not the hundreds of years, we as genealogists are used to working with.

Just a few comments to add to the DNA confusion :)

Art Thomas


18 Dec 2002 :: 14 Nov 2008
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