Lenski e as mutações

“In tens of thousands of generations, with a cumulative population size in the trillions, no coherent new systems have been seen in the fascinating work of Richard Lenski on the laboratory evolution of E. coli. Instead, even beneficial mutations have turned out to be degradative ones, where previously functioning genes are deleted or made less effective. And that’s the same result as has been seen in the human genome in response to selective pressure due to malaria — a number of degraded genes or regulatory elements, and no new machinery.”

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