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That just means you can't call Africans one "race" because they hold all the genetic diversity on the planet. But it doesn't mean there's not some meaningful genetic grouping of populations that splintered out of Africa. Or, concretely, I'm struggling to square what you're saying with the fact that I tell my doctor I'm Hispanic because that means a higher genetic predisposition to things like diabetes.
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Hispanic is probably the perfect example for this. A blonde Argentinian is probably not predisposed to diabetes. What I’m trying to say is racial categorizations don’t follow any rules based in our biology or genetics. For it to be scientific you would need to be able to categorize any given individual 100% based on some unchanging rule that is based on underlying biology. We cannot currently do that and what I’m saying is I don’t think you can come up with a rule like that without the result being hundreds of thousands of different categories of “races”.
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> If you did attempt to classify people into races based on something scientific like genetics, you would end up with hundreds of thousands of “races”. With even more fine tooth classification, you could subdivide those people into further sub groups that becomes indistinguishable from just classifying extended families.

'Biologically speaking', wouldn't that 'just' be something like breeds?

* https://en.wikipedia.org/wiki/List_of_dog_breeds

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Yeah, but at the end of the day, all of this classification is very arbitrary. Until you can come up with a measurable system like “8% genetic differences are defined as a different species” or “can successfully interbreed with viable non-sterile offspring” or something it’s all just a useful pneumonic to understand the world, but it’s not really objective science. Dog breeds are notoriously subjective and just depends on what the registry in the place wanted to do.
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