Question

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

Answer 1

In a random equilibrium mating population, random drift results in a non-directional change in gene frequency. Random drift is a factor that is not directional.

The gene frequencies due to random drift can in actual practice approach limits, i.e., 0 and 1.

This would only be possible if a new population arises due to a tiny sample resulting in one allele being fixed at the expense of another.