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Probably. But not because of genetic changes, because of testosterone changes. People who are lower T develop narrower heads
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i'm brachycephalic and by the latest blood tests i don't have some outstanding (still not low or below normal) testosterone, none of ethnic groups will change this trait in 1-2 generations coz of "low testosterone". None of historical none-brachycephalic ethnic groups were massively low in testosterone.
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Symmetric mesocephalic master race.
I have fullbeard and lots of chest hair since last grade of school, but I never looked like an ogre/testosterone barrel, more on the "noble" side. There are plenty of tall, masculine, hairless people and short, fragile, bearded ones.
There is no dependency (or very indirect one).
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Cephalix index is only a relation between length and breath, basically it means someone with a head breath of 130 and head length of 185, has the same cephalic index like a person with a head breath of 150 mm and 213 head length, but the 2nd guy has a much larger head as the the first. At one point its obvious- the broader the skull the longer it has to be, to be doli/mesocephalic, so even a protruding skull does not necessary mean dolicephaly/mesocephaly at all.
the Bavarian Ofnet Cave seem to be one of the first brachycephalic heads in the Mesolithic but they had not only brachy skulls anyway. it seems there was a trend for higher and rounder skulls, and partially length reduction
https://www.researchgate.net/profile...ll-P3_Q320.jpg
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If it's a dominant trait ,it doesn't make sense that it would "die out" in a matter of generations ,even if there was to exist selection.So either it doesn't really happen or rather maybe a lot of the brachycephaly of the previous generations was related to their stunted growth and not having reached full genetic potential.
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