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For ASPM, the variation arose about 5,800 years ago, roughly correlating with the development of written language, spread of agriculture and development of cities, he said.
So suggests new research that tracked changes in two genes thought to help regulate brain growth, changes that appeared well after the rise of modern humans 200,000 years ago.You’ll feel right at home at this Hawley, PA resort.Whether you’re looking to have a romantic getaway, a honeymoon retreat or a family vacation, Silver Birches is the perfect resort in the Poconos."There's a sense we as humans have kind of peaked," agreed Greg Wray, director of Duke University's Center for Evolutionary Genomics."A different way to look at is it's almost impossible for evolution not to happen." Still, the findings also are controversial, because it's far from clear what effect the genetic changes had or if they arose when Lahn's "molecular clock" suggests — at roughly the same time period as some cultural achievements, including written language and the development of cities.
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Lahn and colleagues examined two genes, named microcephalin and ASPM, that are connected to brain size.