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Originally Posted by abaya
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Guess what--NO ONE fits neatly into racial categories, because race doesn't exist!! woo-hoo!
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Race, as a general descriptor sure as hell exists.
Next time you confuse an Asian from a African, from a European, let me know, and I'll get you a new set of glasses.
Give me a single front tooth and I've got a good chance of determining if it comes from a mongoloid or not.
Think of that a single front tooth and I could identify the owner as either Asian or American Indian 75% of the time.
Now I couldn't do that always, there are cross over in genes, but a race contains a grouping of genes that work well together, drifted together, or were part of a bottle neck, at some point and are now shared by a large group of people.
So its correct to say that MOST human variation in found in all races, meaning that most of the genes found in whites are also found in the black population, even without racial mixing. This leads people to say there are no racial differences. Whats different is the grouping and frequency.
Really if anything there are more races than the typical superficial ones, with less obvious subgroupings. There are real differences in Eskimos and Asians but they are considered the same race. Even groups that self select over the years like Jews and Gypsies could be considered races, though with more mixing than the 'major' races.
The differences might be minor genetically compared to species that didn't suffer our bottleneck but still very real.