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Archiver > GENEALOGY-DNA > 2007-10 > 1191910299


From: "Gary Corbett" <>
Subject: Re: [DNA] 60 Minutes Genetic Genealogy Segment
Date: Tue, 9 Oct 2007 01:12:22 -0500
References: <d54.15e8b218.343c66df@aol.com>


The positions in the tree have to be filled.
The fact that we start running out of humans to fill them,means that many of
the people are filling up more than one spot.
This is Pedigree Collapse.
It means also that you are your own cousin.Everybody is.You have to be.
Many times over.


----- Original Message -----
From: <>
To: <>
Sent: Tuesday, October 09, 2007 12:08 AM
Subject: Re: [DNA] 60 Minutes Genetic Genealogy Segment


>
> My favorite part of the 60 Minutes transcript was:
> .
> >Hank Greely, a law professor at Stanford University,
> >has studied this new field. He worries that people don't
> >realize just how many ancestors they actually have.
> .
> >"Eight generations ago both you and I had 256
> >great-great-great-great-great-great grandparents,"
> >Greely points out. "It doubles every generation.
> >So you've got two parents. You have four grandparents.
> >You have eight great grandparents. Sixteen great-great
> >grandparents. And it adds up fast. It adds up so fast in
> >fact that if you go back 20 generations you've got over
> >a million grandparents."
> .
> >1,048,576 to be exact. And in each generation, DNA testing
> >can provide information about only two of them.
> -----------
> If we believe Hank Greely's and Leslie Stahl's math, going
> back 40 generations would give us more than one trillion
> ancestors in that generation which would be about 10 times
> the number of people who have ever lived on earth.
> .
> See:
>
_http://www.prb.org/Content/ContentGroups/02_Articles/0ct-Dec02/How_Many_Peo
pl
> e_Have_Ever_Lived_on_Earth_.htm_
>
(http://www.prb.org/Content/ContentGroups/02_Articles/0ct-Dec02/How_Many_Peo
ple_Have_Ever_Lived_on_Earth_.htm)
> .
> Maybe it is only Stanford law professors and news correspondents
> "who don't realize just how many ancestors they actually have."
> .
> Kathy J.
>
>
>
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