Among the Yorubas of Ibadan, Nigeria, the incidence of sickle cell anemia is higher than in most populations. People who

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Among the Yorubas of Ibadan, Nigeria, the incidence of sickle
cell anemia is higher than in most
populations. People who are heterozygous for the sickle cell allele
(S) are more resistant to malaria than
people who do not carry the allele. Sickle cell anemia itself is a
recessive, detrimental condition. Given the
observed adult frequencies of the following genotypes, what are the
selection coefficients for the
homozygotes?