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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 color and pattern is a polygenic trait, meaning it is controlled by more than one gene or gene complex. A dog with the gene for black color expression may als â¦ o have the gene for suppression of black and so have a red or yellow coat.n Literature & Language. here i used example as, plolygenic genes to explain polygenic       one of a group of nonallelic genes that together control a quantitative characteristic in an â¦ organism. in other words mean: a group of genes, that determines a number of characeristics of an organism= its phenotype.