"Over the last 50,000 years, modern humans have been subjected to enormous evolutionary pressures, in part from the consequences of their own social culture. They explored new ranges and climates and developed new social structures. Fast adaption, particularly to new social structures, was required as each population strove to exploit its own ecological niche and to avoid conquest by its neighbors. The genetic mechanism that made possible this rapid evolutionary change was the soft sweep, the reshaping of existing traits by quick minor adjustments in the sets of alleles that controlled them. But what began as a single experiment with the ancestral human population became a set of parallel experiments once the ancestral population had spread throughout the world. These independent evolutionary paths led inevitably to the different human populations or races that inhabit each continent."
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Nicholas Wade
Nicholas Wade (born May 17, 1942) is a British science reporter and nonfiction author. He was formerly a staff writer for the Science Times section of The New York Times. He has written a number of books on human evolution, including the controversial A Troublesome Inheritance: Genes, Race and Human History (2014).
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