African American DNA Research Forum
Re: Need Help Understanding
In Response To: Need Help Understanding ()
>I've been doing some preliminary reading on DNA
>First point of clarification: If this is so, how
The X-chromosome is not used for genetic genealogy testing. The Mitochondrial DNA (mtDNA) is used. And yes, the mutation rate of mtDNA is slower than that of the Y-chromosome. With the Y-chromosome they can give you an approximation of how many generations back you have to go to find the most recent common ancestor (MCRA) between two people who have been tested and found to be dna matches.
They don't quote a most recent common ancestor for mtDNA. There is no effect on using cousins. I used two male cousins to test for my two grandfathers' lineages.
I think Melvin has addressed the rest of your question.