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AwesomeDragon97 t1_ja56hqq wrote

Digesting lactose is a highly advantageous trait, so lacking it is a genetic disorder. I have met many people who are lactose intolerant and wish that they could digest lactose, but I have never met one person who wished they were lactose intolerant. The inability to produce certain amino acids is also a genetic disorder, and the entire population has it.

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