Which of the following do you expect if an individual is heterozygous for the sickle-cell trait?

AHe or she will have full-blown sickle-cell disease because the allele is dominant.

BHe or she will not develop sickle-cell disease.

CHe or she will be more apt to acquire a serious case of malaria.

DHe or she will show some symptoms of the disease.

ENone of the above.