Within a large population, if no mutations occur, no migration occurs, all matings are random, and each individual has an equal chance of reproducing, which of the following will probably happen?

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Quizplus · Accepted Answer

With no mutations or migration and random mating, there will be no input of new genetic variation into the population, and no selective pressures acting on the existing variation. Therefore, the allele frequencies will remain unchanged over time, and no evolution will occur. This is known as genetic equilibrium or Hardy-Weinberg equilibrium. If the population size remains constant, there will also be no drift, bottleneck or fixation events. However, any violation of these assumptions (such as selection, migration, mutation, non-random mating, genetic drift, or changes in population size) can disrupt the equilibrium and lead to evolutionary changes.

Within a Large Population, If No Mutations Occur, No Migration