FW: DNA question

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Clagett, Brice

FW: DNA question

Legg inn av Clagett, Brice » 22 mai 2007 20:40:44

Each of us has 46 chromosomes, 23 from the father and 23 from the
mother.
We also get mitochondrial DNA from our mothers.

Six generations back, we had 64 ancestors, assuming no intermarriages.

Doesn't it follow that of our 62 great-great-great grandparents other
than the
pure male and pure female lines, there are least 18 from whom we can
inherit no DNA whatever, and that we cannot know which ancestors these
are?

And of the 1,022 ancestors four generations farther back other than
the
pure male and female lines, there are at
least 976 from whom we can inherit no genetic material whatever, with
a similar lack of knowledge as to which?


Denis Beauregard

Re: FW: DNA question

Legg inn av Denis Beauregard » 22 mai 2007 22:07:30

On Tue, 22 May 2007 15:40:44 -0400, "Clagett, Brice"
<bclagett@cov.com> wrote in soc.genealogy.medieval:

Each of us has 46 chromosomes, 23 from the father and 23 from the
mother.
We also get mitochondrial DNA from our mothers.

Six generations back, we had 64 ancestors, assuming no intermarriages.

Doesn't it follow that of our 62 great-great-great grandparents other
than the
pure male and pure female lines, there are least 18 from whom we can
inherit no DNA whatever, and that we cannot know which ancestors these
are?

And of the 1,022 ancestors four generations farther back other than
the
pure male and female lines, there are at
least 976 from whom we can inherit no genetic material whatever, with
a similar lack of knowledge as to which?

You presume you get a chromosome from either the father or the mother.
Actually, you get a part of both chromosomes, except the Y (only from
the father) and the mt (which is not part of the 23 or 46).


Denis

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