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Archiver > GENEALOGY-DNA > 2011-02 > 1298090907


From: "Michael L. Hébert" <>
Subject: Re: [DNA] X Chromosome Inheritance - Nephew and Two Uncles(autosomes too)
Date: Fri, 18 Feb 2011 22:48:27 -0600
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I wonder about the frequency of these other flavors of recombination and
crossover in humans. If one or more do occur rather frequently, then it
would definitely affect the predicted percentages regarding whether one may
or may not get a non-recombined chromosome from a parent.

It is all certainly fraught. I think I'm about to do a double crossover
myself trying to get a grasp on all of it. But, it is interesting
nonetheless.

Mike

-----Original Message-----
From: David Faux
Sent: Friday, February 18, 2011 7:15 PM
To:
Subject: Re: [DNA] X Chromosome Inheritance - Nephew and TwoUncles(autosomes
too)

Mike,

Alas, it is more complicated than this. There one strand, two strand, three
strand, and four strand cross-overs including double (or triple)
cross-overs:

http://www.mun.ca/biology/desmid/brian/BIOL2250/Week_Five/CXORF.jpg

The suject is fraught with pitfalls to one's understanding.

David K. Faux.

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