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Is there more genetic variation between human races or within human races?

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Per the college textbook Principles of Genetics: "Compared to other species, the humans species is genetically rather uniform. At the nucleotide level, humans have about one-fourth the genetic variation of chimpanzees and about one-tenth that of Drosophila [a species of fruit fly]. Furthermore, most of the genetic variation in the human species--perhaps 85 to 95 percent of it--is within rather than between populations."

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