hrvclv
Regular Member
- Messages
- 453
- Reaction score
- 225
- Points
- 43
- Location
- Auvergne, France
- Ethnic group
- Arvern
- Y-DNA haplogroup
- R1b-U152-DF103
- mtDNA haplogroup
- H1bm
That doesn't mean those traits came from the steppe. The steppe people, for example, did not have lactase persistence. They also weren't blonde and blue-eyed, not the ones from Yamnaya and Catacomb. That's only true for some Andronovo type people more than a thousand years later, who probably picked up those traits in Central Europe.
As I understand it, Krause's graph shows that :
- Blue eye percentages plummet from 100% before the arrival of the farmers down to around 20% immediately after their arrival. Nothing new there. Then the rates abruptly rocket to around 50% in the course of the 3rd millenium BC. Too late for WHG resurgence. But strikingly coeval with CWC and/or BB (who, incidentally, may have picked extra levels of WHG from pockets of I1 and I2a they met on the way, in Poland and northern Germany, where farming must have been less successful).
- SLC24A5 rockets from about 18% to 90% when the farmers move in, then gets a renewed, less spectacular boost after 3000 BC.
- SLC45A2 rises from 0 to 20% when the farmers arrive, then shoots up to 70% post 3000 BC. After which it goes on rising to little by little catch up with SLC24A5.
- Lactase persistence remains unchanged with the farmers and rises very moderately, but still perceptibly, after 3000 BC. The graph suggests something rather like the triggering off of a process that will gradually and steadily consolidate over time, to reach present-day levels.
--- In terms of skin depigmentation, I think what we can infer from the graph is that the farmers did most of the job, but only some of them had both light skin alleles. They brought very high levels of SLC24A5, but were poor in SLC45A2. The steppe people ("somewhat darker than the farmers") didn't have high percentages of people with both alleles either, but brought in the levels of SLC45A2 that somehow completed the job.
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