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Other rabbits such as ermine, squirrel, chocolate chinchilla and lilac ermine also have the c chd gene as the dominant color gene. The next gene is the sable gene represented by c chl, which stands for âchinchilla-light.â Smoke pearl and sable point are examples of rabbits with the chl as the dominant color gene.
These genes are names for their recessive mutant phenotypes, so mice homozygous mutant at the albino locus have no pigmentation (white fur and pink eyes) and heterozygotes and wild type for albino have pigmentation (dark fur and eyes). The albino gene product, tyrosinase, is necessary for the synthesis of all pigment. Mice have two different pigments in each hair, yellow at the tip and black in the rest of the hair. In albino mutants, neither pigment is made. The nonagouti gene product is necessary for the production of the yellow pigment, so mutant nonagouti mice have black hair.