Sickle-Cell Anemia Is Caused by a Recessive Mutation in the Hemoglobin

Multiple Choice

Sickle-cell anemia is caused by a recessive mutation in the hemoglobin gene. However, heterozygote individuals also show a small percentage of sickled red blood cells. What type of inheritance pattern is this an example of?

A) Polygenic inheritance
B) Sex linked
C) Chromosomal nondisjunction
D) Incomplete dominance