Cornelius and Janelle sought genetic counseling because of concern that they might have children with sickle-cell anemia.The counselor determined they each have one recessive allele for sickle-cells and one dominant allele for healthy blood cells.The counselor would tell them that they have a
A)100% chance of having a child with sickle-cell anemia.
B)25% chance of having a child with sickle-cell anemia and a 50% chance of having a child with sickle-cell trait.
C)25% chance of having a child with sickle-cell trait and a 50% chance of having a child with sickle-cell anemia.
D)75% chance of having a child with sickle-cell anemia.

Question

Quizplus · Accepted Answer

The four possible combinations are a normal child (two dominant alleles),a child with sickle cell anemia (two recessive alleles)and two children with sickle-cell trait (one dominant and one recessive).

Cornelius and Janelle Sought Genetic Counseling Because of Concern That