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Thread: A Partial Nuclear Genome of the Jomons Who Lived 3000 Years Ago in Fukushima, Japan

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    Senior Member Catterick's Avatar
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    Yes, Asians are not truly beardless but the wierd dermal traits include unusual growth of facial hair. And the black guy with a beard is obviously not a "pure" Negroid.

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    Senior Member North Vinlander's Avatar
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    Do you think beards are disadvantageous in freezing cold environments?

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    Probably but in primates facial hair and external cartilaginous structures are for visual signalling, not temperature control. It would be nice to know the genes involved in different face and body hair patterns: Ainu have different body hair distribution to Europeans. Spiral hair is no mystery since the gene appears sporadically in mammals including human populations.

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    If it's disadvantageous it would explain the relative sparsity of facial hair in mongoloids, who are the most cold adapted racial type. But I have to wonder why facial hair would freeze like that while the fur of a polar bear or arctic fox or wolf helps it stay warm without freezing over.

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    Yes, as they inherited dermal traits from the Denisovans. But it doesn't follow that every one of those phenotypic changes was particularly adaptive: they came as a suite and the most probable effect under positive selection, was milk quality. Mongoloid milk glands are more tightly packed and the nutritional quality of the milk is different.

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