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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 C allele for full color is dominant over the other alleles for coat color, which means a homozygous mammal with the wild-type phenotype (CC) crossed with any other coat color type will yield an F1 generation with a phenotypic ratio of _______. 3:1 (3 full coat color/wild type, and 1 dilute coat color).