In some parts of Africa, the frequency of heterozygosity for the sickle-cell anemia allele is unusually high, presumably because this reduces the frequency of malaria. Which of the following statements is correct?
A) Homozygotes are less susceptible to the malaria parasite, so there is an advantage to being heterozygous
B) Heterozygotes are less susceptible to the malaria parasite, so there is an advantage to being heterozygous
C) The malarial parasite changes the allele
D) Mendel's law of independent assortment
E) Mendel's law of segregation
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