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Aboriginals have been isolated for 50k years. That is a few thousand generations which is long enough for fairly drastic changes. Whether or not there was enough difference in selective pressure is unclear to me.
The homo floresiensis had tiny brains and it is possible that they traded size for more calorie efficiency. I see claims that they used stone tools, but my sense is that people think they were much dumber than regular humans. A very calorie-restricted location, like an island, can lead to miniaturization of a species, and this can make them trade off seemingly useful talents, like intelligence, for reasons of efficiency.
I think that there will always be clines, and this is visible in England for example, where the East Coast is noticeably blonder than the West. On the other hand, the longer the separation the bigger the differences will be. Some chance is involved, as the difference between Celts and Scandanvians shows. Both are obviously selected for very pale skin over the last 5 to 10 thousand years, but one group became uniformly blonde while the other got quite a bit of red hair. Selecting for less pigment, presumably to absorb enough vitamin D not to have horrible rickets, can be done by many mutations. Some claim that blonde hair spread by sexual selection as well, which is obviously culturally bound.
The major categorization, sub Saharan, New World, Aboriginal, Asian, EMEA is based on large geographical features that blocked population flow. It looks from DNA results that people in the past were more similar than they are now. For example, early Celts were brown-skinned. Once we collect more DNA, this will be obvious, I suppose. As far as I know, there are good reasons to believe that much of the differences in genetics between Asia and Europe are due to selection after leaving Africa. I think that groups in Africa have more diversity and some of this is due to Africa bing inhabited longer. The San and the Pygmies separated very 110kya ago, before humans left Africa. The other splits are earlier.
Humans left Africa 60 to 90k years ago, so these split predate that quite a bit.
There are arguments that claim to distinguish when divergence occurred and to be able to tell whether it was due to the founding population or not. I skipped that part.
I don’t think this is true- there’s no shortage of either red haired Scandinavians or blonde Irishmen. And in fact phenotypically Norwegians and Irish are very difficult to distinguish.
Finland has 2% red hair, while Ireland has 10% and Scotland 13%. This is not quite as big a difference as I expected and presumably comes down to judging what counts as red hair. To have red hair in Ireland requires a lot, while the Finns might have a weaker threshold. With a weaker threshold, Ireland increases to 30%, with this being more common across the Shannon.
80% of Finns are blonde, while "A range of 27%-30% of Irish females have blonde hair, while for males it is much lower: 20%".
I would guess these numbers have changed significantly recently due to immigration. In the past, Ireland had essentially no people with brown eyes. Growing up, I knew two who I met in college. Van Morrison wrote a song "Brown Eyed Girl" when he met one on a train in London, as he was struck by how unusual it was. (Actually, this is the story Van told me, but it seems he has reneged on it, so whatever). In 1952, 0.43% of Irish people had brown eyes, and these were obviously immigrants.
The blondes in Ireland are probably partially from Viking invasions (or immigration, if you like) or related sexual tourism.
I would guess you are neither. There was a time I could reliably tell a Cavan man from someone from the King's County (the king in question was Phillip II of Spain). I doubt I could still do that, unless they both were farmers.
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Ah ha, excellent - you're very modest in your appraisal. Plenty to digest here..
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