The Inheritance of Sickle Cell Anemia Involves Incomplete Dominance

Multiple Choice

The inheritance of sickle cell anemia involves incomplete dominance. (S determines normal hemoglobin, it is dominant; s is the sickle cell gene) . A homozygous recessive person has sickle cell anemia. A heterozygous person has the sickle cell trait. If parental genotypes are SS and ss, what is the probability of offspring having the sickle cell trait?

A) 50%; half are Ss
B) 25%; one quarter are Ss
C) 100%; all are Ss