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In a random mating population in equilibrium, which one of the following brings about a change...

In a random mating population in equilibrium, which one of the following brings about a change in gene frequency in a non-directional manner?

(a) mutations

(b) random drift

(c) selection

(d) migration

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Answer #1

Answer: Choice b: Random drift

Explanation: A directional force of evolution is the one in which specific mode of evolution takes place where a factor is emphasized in a single individual or a population. For example, a mutational change is undoubtedly random in nature but it takes place in a specific nucleotide, hence is directional in nature. Similarly, selection and migration take place in a group of individuals based upon their particular features, hence are directional in manner. Finally, random drift is a completely non-directional evolutionary force which takes place completely randomly in a population leading to change in population equilibrium.

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