Suppose you are telling your roommate that you learned in biology class that within any given human population, height is highly heritable. Your roommate, who is studying nutrition, says, “That doesn’t make sense, because just a few centuries ago most people were shorter than they are now, clearly because of diet. If most variation in human height is due to genes, how could diet make such a big difference?” Your roommate is obviously correct that poor diet can dramatically affect height. How do you explain this apparent paradox to your roommate?
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