試題詳解

18. Which of the following do you expect if an individual is heterozygous for the sickle‐cell trait?
(A)they will not develop sickle‐cell disease
(B)they will show some symptoms of the disease because the allele that causes sickle‐cell disease is not really recessive
(C)they will be more apt to acquire a serious case of malaria
(D)they will have full‐blown sickle‐cell disease because the allele is dominant
(E)none of the listed choices are correct