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thebedla t1_iss9djg wrote

Reply to comment by cowfudger in TIL that when a cat has a flat face (such as a Persian), that is actually a deformity. Breeders, however, are able to find ways of altering the cat’s genetics by choosing who they breed with. They do this because so many people gravitate to the smushed in face. by dioWjonathenL

Yup. What's a deformity and what's an advantageous trait is only situational. Is longer fur a deformity or an advantageous trait? Depends on the environment. Is no hair a deformity or an advantageous trait? Depends on the environment. Whatever helps your genes to spread better is advantageous by definition. Snubbed noses would be a disadvantage, but people killing puppies with normal snouts and keeping only those with snubbed noses makes it an evolutionary advantage.

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