John Inherited a Recessive Allele for Sickle Cell Anemia from His

Multiple Choice

John inherited a recessive allele for sickle cell anemia from his mother and a normal allele from her father. John:

A) has sickle cell anemia.
B) is a carrier of sickle cell anemia.
C) neither has or is a carrier of sickle cell anemia.
D) has a 25% chance of getting sickle cell anemia.