Individuals That Are Heterozygous for Sickle-Cell Anemia Are More Resistant

question 100

Multiple Choice

Individuals that are heterozygous for sickle-cell anemia are more resistant to malaria than those that do not have a sickle-cell allele. Why does the sickle-cell allele not become fixed in the population?

• A)Individuals homozygous for the sickle-cell allele do not have the same resistance to malaria.
• B)Individuals that are homozygous without the sickle-cell allele produce more offspring than those with the sickle-cell allele.
• C)Individuals that are homozygous for the sickle-cell allele have sickle-cell anemia, and are at a fitness disadvantage.
• D)Individuals heterozygous for the sickle-cell allele die earlier than either of the homozygous individuals.
• E)Analysis indicates the allele is becoming fixed in the population.

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