DNA-R1B1C7-L Archives

Archiver > DNA-R1B1C7 > 2007-08 > 1187191784


From: "David Wilson" <>
Subject: Re: [DNA-R1B1C7] Value of CDY
Date: Wed, 15 Aug 2007 08:29:44 -0700
References: <46C2ECF1.5090906@melbpc.org.au>
In-Reply-To: <46C2ECF1.5090906@melbpc.org.au>


CDY is not a complex marker like 389. There are distinct a and b copies, and
the value of one does not affect the value of the other.

CDY is a fast-moving marker with a lot of variability to it. Depending on
the size and possible bias of your sample set, you will find either 37 or 38
emerging as the most frequent value for CDYa in R1b1c7. There does not seem
to be a similar ambiguity in CDYb

Even with the known sample biases in the R1b1c7 Project data base (heavy
representation from some families, zero representation from others), I tend
to think that 38 is probably the better modal value. I will change the
values at the other web sites where I have posted modal haplotypes. But bear
in mind that a better sample (or even a nearly complete collection) of
R1b1c7 haplotypes might let the CDYa modal value flip back again to 37.

I wouldn't pay much attention to CDY markers in comparing haplotypes unless
all other markers -- or perhaps all but one or two -- were identical.
Usually I just ignore the CDY values entirely. To use a rockslide metaphor,
markers like 390, 391, 392 and 19 are rolling boulders, and the CDY copies
are gravel.

David Wilson


-----Original Message-----
From:
[mailto:] On Behalf Of J. David Grierson
Sent: Wednesday, August 15, 2007 5:09 AM
To:
Subject: [DNA-R1B1C7] Value of CDY

People,
My request seems to have been lost in the bits and bytes - not to mention
the much more learned discussions going on. Here 'tis again:

Maybe I have missed a discussion about the value of CDYa, and I guess we can
expect modals to evolve as more tests are done. However, what is the current
view - is CDYa in the R1b1c7 modal 38 as shown in FTDNA (YSearch), or 37 as
shown at _http://www.m222.net/R1b1c7_?
Further, my CDYa = 37 and CDYb = 40, cf modal 38,39 (or 37,39). Does CDY
have the same complications as 389? Does my CDY represent one, two or three
mutations from the notional?
David Grierson




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