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Linking ethnicity and biology
I am french, and came by accident hier. Also I do not speak that well english so please correct me or pardon me for the errors.
I'd just like to say that, after reading some posts in this section, it seems to me you generally tend to make confusions between what is biologically determined, and what is of cultural origin. This is a confusion from a sociological point of view. You may be genetically black, but between blacks born in Africa, the Usa, Eu, or in Brasil, there are of course big differences. So biological proximity is overridden by the cultural conditions. Or, just as opposite, some people they are genetically really similar will have very different cultures. Inside a society the son of the king may have the same body as the peasant, he won't behave the same way at all.
From a more biological point of view, you also seem to forget that our apparence is a priori not at all to be linked with all of our genetic background. Only a small portion of our genes does have a role in it. So a french and a vietnamese may look very different but have much in common. You cannot judge a priori genetic proximity by the visual similarities. This said, since people they live in the same place also mix more their dna than with foreigners, high correlations between appearance and genetic proximity may often be the case. But this is not a biological requisite.
So, maybe you already thought of it, and I just misunderstood. If not, I hope you tend to be convinced :) Have a good day !