Question

a situation in which the heterozygous genotype is fitter than either of the homozygous genotypes is called
○ a balanced polymorphism.
○ bregmanns rule.
○ hemoglobin a.
○ a natural selection adjustment.

Explanation:

In genetics, when a heterozygous genotype has higher fitness than homozygous genotypes, it leads to a stable co - existence of different alleles in a population, which is a balanced polymorphism. Bregmann's Rule is about body size and climate, hemoglobin A is a type of hemoglobin, and natural selection adjustment is a more general concept not specific to this situation.

Answer:

A. a balanced polymorphism