In a particular central African population, 4% are born with sickle-cell disease (they are homozygous recessive at a hemoglobin loci). If this population is in Hardy-Weinberg equilibrium, what percentage of the population is heterozygous at the relevant allele and has the selective advantage of being more resistant to malaria?

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

Agenus is a taxonomic grouping that identifies a collection of species. when a scientist discovers a new species, how is this species assigned to a genus

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