Sickle Cell Anemia Is a Recessive Trait in Humans

Multiple Choice

Sickle cell anemia is a recessive trait in humans.In a cross between a father who has sickle cell anemia and a mother who is heterozygous for the gene, what is the probability that their first three children will have the normal phenotype?

A) 1/4
B) 1/2
C) none
D) 1/8
E) 1/16 will be albino