Genotype frequencies and relative fitness for a population at one locus.
Which evolutionary force is most strongly indicated?
- A
Heterozygote advantage
- Bcheck_circle
Natural selection against the recessive homozygote
- C
Mutation-selection balance favoring SS
- D
Genetic drift
Explanation
The ss genotype has zero fitness while SS and Ss are equally fit. This is selection against the recessive homozygote, which slowly removes s alleles from the population.