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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.
Let the allele for brown coat colour be denoted by B (dominant), and the allele for albino coat colour be denoted by b (recessive). So a pure-breeding brown rabbit has the genotype BB. and a pure-breeding albino rabbit has the genotype bb.