Sickle-cell anemia is a genetic disorder of the blood in which the shape of red blood cells is distorted, resulting in a variety of health problems. The allele for normal blood cell production (H) is dominant to the allele for sickle cell production (h). If one parent has sickle-cell anemia and the other parent is a carrier, what is the probability that their child will have sickle-cell anemia? A. 100% B. 50% C. 75% D. 25% punnet square H h h ? ? h ? ?