DNA Test

Last update by Katie on 06/26/2013
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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 show some symptoms of the disease because the allele that causes sickle-cell disease is not really recessive.
C. He or she will not develop sickle-cell disease.
D. He or she will be more apt to acquire a serious case of malaria.
E. None of the above.

Answer:
B. He or she will show some symptoms of the disease because the allele that causes sickle-cell disease is not really recessive.

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