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Hair color itself probably useless (female ornamental effects, men literally name women after their hair color), except as a proxy for ancestry. We already know ancestry is predictive of aggression etc., though causal mechanism is disputed of course.
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There's a few more of these breeding experiments. Here's a new rat study.https://link.springer.com/article/10.1134/S1022795412100079 …
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On the other hand, cats are domesticated too and have been heavily selected, with often monogenic colorations, but the relationship between fur color & aggression is odd and a little questionable: https://cloudfront.escholarship.org/dist/prd/content/qt4k90t3ck/qt4k90t3ck.pdf … (Black & brown are actually least aggressive cat colors.)
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There's also the other thing that the alt-right doesn't like: domesticated varieties usually get smaller brains. If Euros are self-domesticated compared to Africans, they would also be expected to be duller, smaller brains, but not what we see. So matter is more complex.
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They also caution 'that human populations are therefore not expected to consistently exhibit the associations between melaninbased coloration and the physiological and behavioural traits reported in our study.'
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I wonder would could cause them to have to write that. Hmmm!
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Shows up in breeding studies too. E.g. recent rat study.https://link.springer.com/article/10.1134/S1022795412100079 …
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