A hornless ox was mated with a horned cow They procreated two individuals one of them of horned offspring what is the genotype of parents and individuals if you know that's hornless trait is dominant over horned trait?

The XY chromosome (otherwise known as milder's chromosome) is quite dominant in that case, as a single-horned cow would be a likely mutation. Since any other form of cow would be a sterile and abstract breed, we can pronize that the XY genotype was dominant.