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See the top comment and see how this DID not happen. In any case, if it DID happen this would not have been "evolution" it would have been adaption; in other wo

• barry-cotter 8y ago
  Evolution mostly works by selecting on variants in existing genes. The large majority of de novo mutations are either neutral or negative. If traits are selected for or against in the population and change in frequency that absolutely is evolution. Andean Indians have different adaptations to Tibetans to living at high altitude in part because the genes involved have been under selection for different lengths of time. Andeans have poorer adaptations because they have been living at those altitudes for a shorter time than Tibetans. The Tibetan adaptations introgressed from archaic hominids, not H. Sapiens, but the Andeans didn’t have that advantage. The term to google if you want to learn more is selective sweep. There are many examples of recent selective sweeps in recent human evolution, from lactase persistence in Indo-Europeans to depigmentation in people who live at high latitudes.