Four of the Following Characterize a Population in Genetic Equilibrium

Question

Four of the following characterize a population in genetic equilibrium.Which one is the exception?  
A) Large population size
B) No mutations
C) Differential reproduction
D) Absence of gene flow
E) Random mating

Accepted Answer

Differential reproduction leads to natural selection, which can disrupt genetic equilibrium. The other options all contribute to genetic equilibrium. A large population size helps prevent genetic drift, the absence of mutations means there is no new genetic variation being introduced, the absence of gene flow prevents new genes from entering the population, and random mating ensures that alleles are being combined in a way that is not biased.