GENEALOGY-DNA-L ArchivesArchiver > GENEALOGY-DNA > 2001-11 > 1005764430
Subject: Re: [DNA] newbe question
Date: Wed, 14 Nov 2001 14:00:30 EST
In a message dated 11/14/01 6:04:46 AM Pacific Standard Time,
> To what extent would a DNA test provide proof for a relationship between
> male first cousin's once-removed?
> I am trying to determine the father of my father. The man I believe may be
> my grandfather also fathered another son who may be available for testing
> with me.
There are two kinds of DNA tests which might give you some information. One
is a test of Y chromosome markers. If you and your supposed first cousin
don't match, that would rule out your hypothesis. If you and your cousin do
match, that would mean you have a common male ancestor. However, it doesn't
prove that it's your cousin's father -- it could be another male relative.
The other kind of DNA test is traditional paternity testing, which uses
markers on several different chromosomes. These markers come in pairs, and
you would have a 1/4 chance of inheriting any specific marker, while your
cousin would have a 1/2 chance. There MIGHT be enough markers in common to
give you a reasonable probability that the man in question is or is not your
You might want to check some paternity testing laboratories, such as
http://www.genetree.com, to see how they would advise you.
GENEALOGY-DNA List Administrator