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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."The genetic evolution of humans in the very recent past might in some ways be linked to the cultural evolution," he said. wikia JWPlayer=:wikia JWPlayer);define('ext.Engine.video.player.Tracking',[ 'ext.Engine.utils.event Dispatcher','ext.Engine.video.player.jwplayer.jwplayer Tracker','ext.Engine.Parser'],function(event Dispatcher,tracker,vast Parser));define('ext.Engine.video.player.jwplayer.jwplayer Tracker',['ext.Engine.video.player.player Tracker'],function(player Tracker));define('wikia.article Video.featured Video.autoplay',['ext.Context','Test','wikia.article Video.featured Video.cookies',],function(ad Context,ab Test,featured Video Cookie Service));define('wikia.article Video.featured Video.ads',['ext.Context','ext.Engine.Url Builder','ext.Ad Unit Builder','ext.Registry', 'ext.Provider','ext.Engine.video.article Video Ad','ext.Engine.video.player.Tracking','ext.Engine.Debugger','ext.Engine.Parser','wikia.article Video.featured Video.lagger','wikia.log','wikia.window',require.optional('ext.Engine.wrappers.prebid'),],function(ad Context,vast Url Builder,mega Ad Unit Builder,slot Registry,src Provider,article Video Ad,ads Tracking,vast Debugger,vast Parser,fv Lagger,log,win,prebid));define('wikia.article Video.featured Video.lagger',['ext.Context','wikia.lazyqueue',require.optional('ext.Engine.mobile.mercury Listener')],function(ad Context,lazy Queue,mercury Listener));define('wikia.article Video.featured Video.cookies',['wikia.cookies'],function(cookies));require(['wikia.window','wikia.cookies','wikia.tracker','wikia.tracking Opt In','Test','ext.Context', 'wikia.article Video.featured Video.data','wikia.article Video.featured Video.autoplay','wikia.article Video.featured Video.ads','wikia.article Video.featured Tracking','wikia.article Video.featured Video.cookies',require.optional('ext.Engine.lookup.a9')],function(win,cookies,tracker,tracking Opt In,ab Test,ad Context,video Details,featured Video Autoplay,featured Video Ads,featured Video Moat Tracking,featured Video Cookie Service,a9){if(!

Those criticisms are particularly important, Collins said, because Lahn's testing did find geographic differences in populations harboring the gene variants today.The differences between words, or DNA sequences, are a measure of how closely languages, or species, are related.Gray and Atkinson analysed 87 languages from Irish to Afghan.The farmers themselves may have moved, or natives may have adopted words along with agricultural technology.The conclusion will be controversial, as there is no consensus on where Indo-European languages came from.Using DNA samples from ethnically diverse populations, they identified a collection of variations in each gene that occurred with unusually high frequency.In fact, the variations were so common they couldn't be accidental mutations but instead were probably due to natural selection, where genetic changes that are favorable to a species quickly gain a foothold and begin to spread, the researchers report.The resulting tree matches many existing ideas about language development.Spanish and Portuguese come out as sisters, for example - both are cousins to German, and Hindi is a more distant relation to all three.Scientists attempt to date genetic changes by tracing back to such spread, using a statistical model that assumes genes have a certain mutation rate over time.For the microcephalin gene, the variation arose about 37,000 years ago, about the time period when art, music and tool-making were emerging, Lahn said.

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