The Evolution of Lactose Tolerance - HHMI BioInteractive Video - YouTube - 0 views
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Lottie Peppers on 22 Apr 16All adult mammals but humans are lactose intolerant. Follow human geneticist Spencer Wells, director of the Genographic Project of the National Geographic Society, as he tracks down the genetic and societal changes associated with the ability to digest lactose as adults-or lactose tolerance.