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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

The answer is random drift.

When the population is in equilibrium, gene frequency changes in a non-directional manner in random mating. Random drift which is a non-directional factor, brings this change and in practical situation, the gene frequencies stay in limits i.e., 0 and 1.

This possibilities occur when one allele get fixed at the cost of another one due to very small sampling in a new population. For this reason the alteration of gene frequency can be brought about without the presence of any particular direction force i.e. mutation, section and migration. This conversion in gene frequency is called random genetic drift

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