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Archiver > GENEALOGY-DNA > 2007-05 > 1178119390


From: "Valery Zaporozhchenko" <>
Subject: Re: [DNA] Coefficient of Autosomal
Date: Wed, 2 May 2007 19:23:10 +0400
References: <cd0.db90a23.336a03f1@aol.com>


very unusual

----- Original Message -----
From: <>
To: <>
Sent: Wednesday, May 02, 2007 7:10 PM
Subject: Re: [DNA] Coefficient of Autosomal


> > (mailto:) :
> > I feel that I have more of my 7th great
> > grandfather's DNA because I descend
> > from him in many paths. [Granted, I could
> > have three times as much of his DNA--but
> > it would amount to less than 3% of total.]
> --
> OK. I am still working on learning the basic statistics so I
> will let the UK, MIT and Stanford whiz kids work out the
> exceptions to the rule. Let's just see if my answers match
> with the geneticist's when it comes to basic probability
> for the above pedigree (see first posting in this thread).
>
> When figuring how much genetic material Teunis Pier has in
> common with Floyd Kelley, I come up with
> 1/256 + 1/256 + 1/128 + 1/128 = 6/256
> since there are four different pathways to
> inherit genes from him.
>
> Under normal circumstances, 7 generations
> would be 1/128 and 8 generations would be 1/256
> so the inbreeding does have a significant effect.
>
> Now when I figure out how much DNA Floyd Kelley
> would have in common with a first cousin descended
> also from Isabelle and Othello, the numbers do not
> strike me nearly as dramatic. This first cousin shares
> 0.129 instead of the usual 0.125 with Floyd Kelley.
> 1/8 + 2/512 + 4/32768
>
> Well, if my numbers are way off, then I will go back to
> the drawing board. I may need to dust off some
> cobwebs in the math part of my brain.
>
> This mental exercise is actually a good one to see
> what the effect of converging pedigrees has on
> probabilities because many of us descend from
> early colonists in N. America where people were
> often related to each other. I also have some
> 17th century Dutch ancestors from NY.
>
> Kathy J.
>
>
>
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>
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