Sickle Cell Anemia Is a Disease That Causes Red Blood

Multiple Choice

Sickle cell anemia is a disease that causes red blood cells to clump.It often leads to blood clots and strokes, among other conditions.Although sickle cell anemia is due to a recessive allele and nearly all homozygous individuals have the disease, its effects vary, as some individuals with the disease can live fairly normal lives well into middle age, and others die in infancy.Based on the above, which statement about sickle cell anemia is true?

A) It shows low penetrance.
B) It exhibits epistasis.
C) It exhibits variable expressivity.
D) It is a result of heterosis.
E) It shows quantitative variation.