You purchased a black stallion of unknown genotype. You mate him to a red mare, and she delivers twin foals, one red and one black. (a) Assuming that alternative alleles of a single gene are involved, what can you and what can't you say about the coat color alleles in these horses?
(b) How would your belief in how coat color is inherited be influence by the knowledge that mating the same black stallion and red mare in the following season produced twin foals that were both black? (c) Among these horses, what cross, or crosses, could provide a definitive answer to how coat color is inherited?