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[–] Broc_Lia ago 

Alot of species do it, a specific feature delicately based on one or two gene expressions is singled out as a basis for attraction. As a result, an animal with developmental issues will probably have divergent features, such as losing their blue pigment. Kinda like a red flag.

For humans facial charactaristics are key, we can tell male from female just from seeing a part of someone's jaw and women have been shown to be able to assess the health of a man just by seeing the triangle of his cheek. Serious disorders like down's syndrome are immediately apparent.

Nature is hard on mutants, lol.