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If there is a 5% advantage for being able to digest milk (lactose) and assuming that...

If there is a 5% advantage for being able to digest milk (lactose) and assuming that this ability is derived from a dominant allele, how many generations of selection would it take for the allele to increase from 1% to 90% in a population? If each human generation comprises of 25 years, how many years of selection is this? If in a different population, it has taken 8000 years for the frequency of the same allele to increase from 1% to 5%, what was the advantage (up to 3 decimals) of digesting milk in this population?

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Answer #1

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Lactase persistence, and therefore lactose tolerance, is inherited as a dominant trait. Lactose intolerance is the result of being homozygous for the recessive lactase allele that is poorly expressed after early childhood that is why, those who are lactose intolerant are not allergic to milk, or even to lactose. If they lack the digestive enzyme they needed to break down the lactose, or the sugar in milk that is Lactose-free milk is the same as regular milk except for the addition of lactase. Lactase does make milk taste sweeter.

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