An African American couple are undergoing genetic counseling to determine the likelihood of producing children with a recessively genetic blood condition. The genetic tests reveal that the father carries the trait to produce abnormal hemoglobin, HbS, which causes crystallization in RBCs and deforms their shape when 02 is low. This condition causes painful crises and multiple infarcts and is termed
A. hemophilia.
B. thalassemia.
C. sickle cell anemia.
D. iron-deficiency anemia.
Answer: C