Cornelius and Janelle Sought Genetic Counselling Because of Concern That

Multiple Choice

Cornelius and Janelle sought genetic counselling because of concern that they might have children with sickle-cell anemia.The counsellor determined they each have one recessive allele for sickle-cells and one dominant allele for healthy blood cells.The counsellor would tell them that they have a

A) 100 percent chance of having a child with sickle-cell anemia.
B) 25 percent chance of having a child with sickle-cell anemia and a 50 percent chance of having a child with sickle-cell trait.
C) 25 percent chance of having a child with sickle-cell trait and a 50 percent chance of having a child with sickle-cell anemia.
D) 75 percent chance of having a child with sickle-cell anemia.