If 2 spot (S) is dominant to 4 spot (s), give the genotypes for the parents in the following crosses:
(a)2 spot×2 spot yields 2 spot and 4 spot
(b)2 spot×4 spot yields only 2 spot
(c)2 spot×4 spot yields 2 spot and 4 spot
(d)2 spot×2 spot yields only 2 spot
(e)4 spot×4 spot yields only 4 spot