One of the most famous examples is the spread of a gene that allows adults to digest milk. Though children were able to drink milk, they typically developed lactose intolerance as they grew up. But after cattle and goats were domesticated in Europe and yaks and mares were domesticated in Asia, adults with a mutation that allowed them to digest milk had a nutritional advantage over those without. As a result, they were more likely to have healthy offspring, prompting the mutation to spread, Hawks said.
I ask the student if they have any conclusions about state of evolutionary development ?
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