Two parents are carriers for the sickle cell trait, which exhibits classical dominant/recessive behavior. A mother is heterozygous for type B blood, and the father is heterozygous for type A. What are the chances that this child will have type O blood, and be a carrier for sickle cell disease? (Please show work and/or explain. i think it is 3/16 chance on a dihybrid cross but I am not sure) .