In a worldwide survey of 50 populations, a team of geneticists has identified many fingerprints of natural selection in the human genome. These are sites on the genome where specific sequences of DNA show signs of having become more common in the population, presumably because they helped their owners adapt to new climates, diseases or other factors. The genetic regions where natural selection has acted turn out to differ in various populations, doubtless because each has been molded by different local forces on each continent.
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Genetic Copy Number Variations Compared Between Races
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