Originally posted by BlackWolf
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Most of the Irish are R-L21, and many of them are R-M222. Those subclades are pretty rare thus far among the Basques, who have a high frequency of R-M153 and R-P312*.
The idea that the Irish and the Basques are closely related is outdated and was based on studies with 6-marker haplotypes and on the now discredited idea that "R1b" spent the last Ice Age in Iberia.
R1b (M343) wasn't anywhere near Iberia during the last Ice Age. It was R1b1b2 that entered Europe from SW Asia during the Neolithic Period and spread northwest from there.
I think I already posted the ISOGG (International Society of Genetic Genealogy) blurb on R1b1b2, but you apparently missed it, so here it is again.
Haplogroup R1b1b2 (M269) is observed most frequently in Europe, especially western Europe, but with notable frequency in southwest Asia. R1b1b2 is estimated to have arisen approximately 4,000 to 8,000 years ago in southwest Asia and to have spread into Europe from there. The Atlantic Modal Haplotype, or AMH, is the most common STR haplotype in haplogroup R1b1b2a1a (P310/S129) and most European R1b1b2 belongs to haplogroups R1b1b2a1a1 (U106) or R1b1b2a1a2 (P312/S116).
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