Genes that control coat color in mammals represent some of the best early examples of genes with multiple alleles exhibiting different phenotypes. A classic example is the C gene in hamsters. Three of the known alleles of this gene are C, ca and ck. Each supplies a different amount of black pigment to the coat hair. The phenotypes of three different homozygous strains are as follows.would mate the true-breeding ca ca hamsters to the true-breeding ck ck hamsters to produce heterozygous ca and ck F1 progeny, the F1 progeny cack hamsters self fertilized, From the fraction of F2 progeny that have the wild type black phenotype, Crosses and their interpretation that would have allowed geneticists to come to the conclusion that ca and ck were likely to be alleles of the different gene. What will be the ratio of F2 hamster; -triyambak.org