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Biochemistry of Dog Coat Color. The color of a dogâs coat is determined by relative levels of two pigments: eumelanin, which can be either brown or black, and pheomelanin, which is yellow to orange or red. Both pigments are generated by metabolism of tyrosine. A schematic diagram of the pathway is below. Schematic of the melanin synthesis pathways.
the genetics of palomino. Palomino horses have a base coat color of chestnut (i.e. of genotype ee, eaea or eea at the extension locus) and genotype C+CCr at the C locus (the cream dilution gene). The CCr allele is semi-dominant and dilutes red pigment to yellow in a single dose (i.e. in palominos).