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Bookmeat ,

Height, build, differentiation between sexes.

Atin ,

Sexual dimorphism has been in our genes well before the Homo genus has been around.

Bookmeat ,

I read the question as a difference of traits rather than whole new traits, if that makes any sense.

So my suggestion was that the strength of sexual dimorphism varies. That is, some ethnicities may have a very significant difference in appearance between sexes, but in other ethnicities the difference would be lessened.

artichokecustard ,

sure, how about some examples to consider?

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