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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.
13. In cattle, roan coat color (light red) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. When two roan cattle are crossed, the phenotypes of the progeny are found to be in the ratio of 1 red:2 roan:1 white.a.. white x roan B. roan x roan C. red x roan D. red x white E. All of the above crosses would give the same percentage of roan. 14. Roan color (Rr) in the above cattle is the result of red and white color genes.