Jolie has sickle-cell trait, a temporary, relatively mild form of sickle-cell anemia, but does not have full-blown sickle-cell anemia. Her condition is most likely the result of
A)incomplete dominance with one allele for normal blood cells and one for sickle-shaped cells.
B)two recessive alleles for sickle-shaped cells.
C)a dominant sickle-shaped cell allele and a recessive normal blood cell allele.
D)two dominant alleles for normal blood cells.

Question

Quizplus · Accepted Answer

Sickle-cell trait is the result of incomplete dominance, where the individual has one allele for normal blood cells and one for sickle-shaped cells. This results in a milder form of sickle-cell anemia. Full-blown sickle-cell anemia is the result of having two recessive alleles for sickle-shaped cells. Dominant and two recessive alleles for normal blood cells would result in a completely normal phenotype.

Jolie Has Sickle-Cell Trait, a Temporary, Relatively Mild Form of Sickle-Cell