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Subject: Re: [DNA-R1B1C7] R1b1c7 in Ireland vs. Scotland
Date: Tue, 7 Oct 2008 18:33:06 EDT
In a message dated 10/7/2008 10:35:32 A.M. Central Daylight Time,
writes:
Playing around with the below site by entering various surnames left me with
the question, has anyone ever come up with figures, frequencies per million,
or something like that, to compare R1b1c7 distribution in Northwest Ireland,
lowland Scotland, northern England? I have seen a percentage figure for NW
Ireland, but I don't recall seeing a similar statistic for those other areas.
I'll quote this from the Trinity study (for what it's worth).
The 6-STR IMH is virtually absent from much
of Britain but reaches frequencies of up to 7.3% (16.7%
including likely one-step derivatives) in western and central
Scottish locations.
They quote from the earlier Capelli Y-chromosome census of the British Isles.
Compare that to their statement about IMH (R1b1c7) based on their own DNA
tests.
The IMH distribution is
uneven, showing a distinct frequency peak in northwestern
Ireland, where it accounts for 16.9% of Y chromosomes
(21.5% when one-step derivatives are included)
The Capelli study only included a handful of samples from Ireland.
Then of course you also have to wonder how many R1b1c7 in NW Ireland and in
Ulster generally are Plantation era Scots. The Trinity study though seems to
have concentrated mostly on typically Irish surnames so this might not be a
factor.
John
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