The gene agouti/ASIP has been implicated in pigmentation, including melanism, in mice and other animals. If a cat carries 2 copies of a particular 2-basepair deletion in the ASIP gene, their coat is likely to be a solid or black color.
ASIP
Autosomal recessive
Current data does not indicate that this trait is more common among specific breeds.
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64 genetic health markers
50 genetic trait markers