Sugar can’t have the K B allele or she would have solid color instead of the brindle pattern because K B is dominant over k br and k y . She could have either the genotype k br k br or k br k y , sinc...Sugar can’t have the K B allele or she would have solid color instead of the brindle pattern because K B is dominant over k br and k y . She could have either the genotype k br k br or k br k y , since the k br allele is dominant over the yellow allele (k y ). This means she has the dominant phenotype for TYPR1, so her genotype would be “B-”. Because she has eumelanin and not pheomelanin in her coat, she has the dominant phenotype for MC1R, so her genotype would be “E-”.
Brindle coloration is a black and brown striping pattern that is caused by different alleles at the “K locus”, which is probably a gene called ASIP that controls pigment switching (Figure \(\PageIndex...Brindle coloration is a black and brown striping pattern that is caused by different alleles at the “K locus”, which is probably a gene called ASIP that controls pigment switching (Figure \PageIndex1; Ciampolini, 2013). There are three alleles of the K locus: K B , k br , and k y (Kerns, 2007). k br produces the brindle color pattern and is dominant over the k y allele. This means that dogs with the genotype k br k br or k br k y will have the brindle color pattern.
