2 out of 2 members found this post helpful.
The Gedrosia component and the origin of R1b M269
I was recently looking at the K12a spreadsheet for the participants of the Dodecad proect and I've noticed that R1b frequencies and the Caucasus admixture are totally unrelated in Northwestern Europe. If the proto IE carrying R1b M269 or R1b L11 really originated around the Black sea area we would expect a higher rate of Caucasus component than the Gedrosia one for the British or Basque people for instance. But the Irish in the Dodecad project have 1,5% of Caucasus and 9,5% of Gedrosia and the French Basque have 0,1% of Caucasus vs 7,6% of Gedrosia.
As we know, the Basque do have really low frequencies of "neolithic haplogroup" such as G2a, EV13, J1, T etc. we can conclude that the Caucasus component (only 0,1% among French Basque but 22,3% for Otzi) only represents the neolithic legacy of men carying G2a, EV13, J1 etc.
So we have the caucasus admixture related to Neolithic farmers and R1b somewhat related to the Gedrosia admixture in Northwestern Europe (and in the Basque country).
It really looks like R1b men came to Europe directly from an area East of the Caspian sea without settling around the Black sea area (Maykopp etc) .