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  • Diagram explaning genotypes of lactose tolerance and intolerance
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 3 September 2009 Size: 430 KB Referencing Hub media

    Most people in the world are lactose intolerant, but a genetic mutation where a cytosine (C) nucleotide in a person’s DNA is replaced with a thymine (T) nucleotide allows them to digest milk.

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