Sickle cell anemia (a serious heritable disease) appears to be maintained via balancing selection in some Af-rican populations, because heterozygous carriers for the fully recessive disease allele are less affected by ma-laria parasites

Is this a case of antagonistic pleiotropy?
a. Yes, the same allele has positive effects on one trait and negative effects on another trait.
b. Yes, wild-type and sickle cell alleles have antagonistic effects.
c. No, there is no time lag between the two traits (i.e., as in early vs. late acting).
d. No, it involves a dominance interaction between the wild-type and the sickle cell allele.


B

Biology & Microbiology

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