Which of the following do you expect if an individual is heterozygous for the sickle-cell trait?
a) he or she will have full-blown sickle-cell disease because the allele is dominant.
b) he or she will not develop sickle-cell disease.
c) he or she will be more apt to acquire a serious case of malaria.
d) he or she will show some symptoms of the disease.
e) none of the above.