a. One parent has sickle cell disease but the other parent has two normal alleles for
hemoglobin. What is the probability of the couple’s children having sickle cell disease:______
Having sickle cell trait: _________________ Having 2 alleles for normal hemoglobin:
_______________

b. Both parents are sickle cell carriers. What is the probability they will have a child with sickle
cell disease: ________________ A child with sickle cell trait (carrier state): ______________
A child with normal hemoglobin: __________________

c. One parent has sickle cell trait and one parent has -thalassemia trait. What is the
probability they will have a child with some type of anemia: ________ A child with sickle cell
trait: ______A child with -thalassemia trait: _____ A child with normal hemoglobin: ________