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African American DNA Research Forum

Re: alone in L3
In Response To: Re: alone in L3 ()

Debra, mtDNA is not part of autosomal DNA. Here are the 4 basic types of DNA.

There is Y-chromosome DNA or Y-dna which only males get - passed from father to son. All that does is say "It's a boy, but I don't know what he'll look like."

There is X-chromosome DNA or X-dna which everyone gets from their mother AND which females also get from their father. Two Xs say "It's a girl, but I don't know what she will look like."

There is Mitochondrial or mtDNA which everyone gets from their mother, but only females pass to the next generation - passed mother to child. Doesn't determine the sex or look of the child.

And then there is autosomal DNA which everybody gets 50-50 from both parents, a mix of dna bits and pieces from ALL of their ancestors. "Okay, let's give her grandpa's nose, but grandma's eyes. Let's give her great-grandma SMITH's chin, then let's get that jawline from great-great-grandpa JONES." I'll bet Nature has great fun deciding which piece of the puzzle to give to what child.

Autosomal DNA does not include Y-dna, does not include X-dna, does not include mtDNA.

And remember, there are 8+ million possible combinations of autosomal DNA on mother's side, PLUS another 8+ million possible combinations on father's side.


18 Dec 2002 :: 14 Nov 2008
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