I am no geneticist, but genetic information related to color/pattern mutations hitch a ride on other genetic information that can be fatal when combined. Eg: Super Jaguar Carpets are a lethal super. There is a direct link between the homozygous form of Jaguar and incomplete development of the lungs that results in an animal that is completely white and incompatible with life outside the egg. In essence you could say a single gene Jaguar Carpet is heterozygous for Dead.
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