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Genetics

10 March 2011

Why we have big brains and smooth penises

Missing chunks of DNA responsible for turning genes on and off explain why humans have big brains and why the human penis is not covered with prickly spines, a study has shown.

Missing chunks of DNA responsible for turning genes on and off help explain some key differences between chimpanzees and humans, including why humans have big brains and why the human penis is not covered with prickly spines, US researchers said.

They found 510 gene segments that are present in chimps and other mammals, but are missing in humans.

 

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