Cornelius and Janelle Sought Genetic Counseling Because of Concern That

Multiple Choice

Cornelius and Janelle sought genetic counseling because of concern that they might have children with sickle-cell disease. 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 disease.
B) 25% chance of having a child with sickle-cell disease 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 disease.
D) 75% chance of having a child with sickle-cell disease.