Presume that the number of leaves in clovers is controlled by the combined actions of two genes,A and B,with no contributions from the environment.A/A results in four leaves,A/a in three leaves,and a/a in two leaves.Moreover,the genotypes B/B and B/b result in one additional leaf (b/b has no effect on leaf number). a)Based on the above information:
A)A has an additive mode of action and B has a dominant mode of action. B)A has a dominant mode of action and B has an additive mode of action. C)both A and B have a dominant mode of action. D)both A and B have an additive mode of action. E)the respective modes of action of A and B cannot be determined.