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Archiver > GENEALOGY-DNA > 2007-06 > 1181086057


From: "Nelda Percival" <>
Subject: Re: [DNA] matches in R1b haplogroup
Date: Tue, 05 Jun 2007 18:27:37 -0500
In-Reply-To: <200706051523.18738.didier.vernade@orange.fr>


Hi Didier Vernade,
I am going to try to answer this, but if I'm wrong I'm sure it will be
corrected right away.
First lets talk about a Haplotype it uses the results of tested STR markers.
If two or more people compare these marker results and they are closely
matched say 35 out of 37, they are related .... In using 25 markers and a
mismatch of 2 as in your example then they probably are related but it is
worth extending the tests to at least the 37 markers, to confirm the
results.

Now Haplogroups are estimated on the first 12/14 STR markers, but remember
that is a estimation not a proven fact. A proven Haplogroup is proven by
TESTING the SNP's (prounced Snip). Each, Hapolgroup has certain SNPs. If
you are reading that a person (FTDNA) has the word tested beside it.. R1b1
(tested in red) it is my understanding that is really an estimated result...
not that any SNPs were tested to get the result. It is not uncommon for a
R1b1 to have the estimation changed to R1b1c* some of my group had this
changed in much the same way.. But, I went on and had one tested at EA for
the S21, S26, S28, and S29. These were all ancestral meaning those SNPs
mutations were not found. That proved the male tested was R1b1c* and since
the first 12 STR markers (of the Haplotype of three of the others) matched
each other, I can presume (pretty acturatly) that all three are R1b1c's as
is estimated by FTDNA. Of these three males they have been tested at 37
markers and are 2 markers different from each other indicating a close
relationship say within 20 generations.

I hope that helps, and if I stated something incorrectly.. Please somebody
correct me so I too can learn...

Regards
Nelda

----Original Message Follows----
From: Didier Vernade <>
Subject: [DNA] matches in R1b haplogroup
Date: Tue, 5 Jun 2007 15:23:18 +0200


Dear list,

My question is rather common : what are the chances to be in the same R1b
subclade is you have a few mismatches, let say 2 mismatches on 25 markers
with someone else ? There are the calculations and the facts and the answer
may determine whether someone should take a SNP test. I really would like to
know whether it happened that someone with 2 mismatches (on 25 markers) with
a known member (tested) of a particular R1b subclade was found to be R1b1c*
or even of a different subclade ?
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