In a Bacterial Population, the Frequencies of Two Alleles at the Same

Multiple Choice

In a bacterial population, the frequencies of two alleles at the same locus remain very constant.In cases where researchers have perturbed the frequencies of the alleles, the frequencies have come back to the same equilibrium point.What is the most reasonable cause of these observations?

A) Clinal variation
B) Heterozygote advantage
C) Frequency-dependent selection
D) Hardy-Weinberg equilibrium
E) Genetic drift