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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.
Coat colour is determined by alleles for white coat colour and alleles for red coat colour. The presence of red and white alleles in one individualâs genotype results in roan coloured coat.Determine the genotype of the roan parents and explain how the presence of these alleles in the genotype contribute to the phenotype.oat colour is determined by alleles for white coat colour and alleles for red coat colour. The presence of red and white alleles in one individualâs genotype results in roan coloured coat.