Garth writes in wanting to know why the prevalence of lactose intolerance is nearly 100% in countries like South Korea, but down in the low single digits in countries like the UK. James Tytko asked Mark Thomas, Professor of Evolutionary Genetics at UCL, for the answer... Like this podcast? Please help us by supporting the Naked Scientists

Why does the distribution of lactose intolerance vary?

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Why does the distribution of lactose intolerance vary?

Why does the distribution of lactose intolerance vary?