"Even lactase persistence does not bestow a purely biological advantage per se so great as to explain its rapid predominance in Northern Europe and its considerable presence even in Southern Europe. After all, there are plenty of other foods to consume besides raw milk. Rather, social behavior must also have played a role, just as it does today: Once milk-drinking becomes common in a society (or at least among the privileged class), those who are lactose-intolerant are considered diseased or at least annoying, and therefore socially disadvantaged."
How do you know what part of the selection coefficient of lactase persistence or light skin is attributable to a direct biological effect or to social effect? I've never seen any way to measure that. You can measure an allele frequency at one time and at a later time and calculate a selection coefficient but it is extremely difficult to tell what mechanisms contribute to it.
You are making an assertion, but I can't see what objective support you have for it. "Political correctness" is a common insult in political "arguments," but it doesn't have much relevance in science.
How do you know what part of the selection coefficient of lactase persistence or light skin is attributable to a direct biological effect or to social effect? I've never seen any way to measure that. You can measure an allele frequency at one time and at a later time and calculate a selection coefficient but it is extremely difficult to tell what mechanisms contribute to it.
You are making an assertion, but I can't see what objective support you have for it. "Political correctness" is a common insult in political "arguments," but it doesn't have much relevance in science.
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