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About: Drift-barrier hypothesis     Goto   Sponge   NotDistinct   Permalink

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The drift-barrier hypothesis is an ecological hypothesis formulated by Michael Lynch in 2010. It suggests that the perfection of the performance of a trait, in a specific environment, by natural selection will hit a hypothetical barrier. The closer a trait comes to perfection, the smaller the fitness advantages become. Once this barrier is reached, the effects of further beneficial mutations are unlikely to be large enough to overcome the power of random genetic drift. Selection generally favors lower mutation rates due to the associated load of deleterious mutations that come with a high mutation rate.