A population stabilizes p near 0.5 over time, as in heterozygote-advantage scenarios (e.g., sickle-cell HbS in malaria zones). This pattern is
- A
Directional selection toward fixation
- B
Bottleneck effect
- Ccheck_circle
Balancing selection maintaining polymorphism
- D
Genetic drift to fixation
Explanation
Balancing selection (such as heterozygote advantage) maintains both alleles at intermediate frequencies because heterozygotes have higher fitness, preventing fixation of either allele.