Question

In a random mating population in equilibrium, which of the following brings about change in gene frequency in a non-directional manner?
(a)Mutation
(b)Random drift
(c)Selection
(d)Migration

Answer 1

A change in a DNA sequence is a change. It may result from errors in DNA copying made during cell division, exposure to ionizing radiation, exposure to mutagenic chemicals, or virus infection.

Complete answer:
Mutations bring about a shift in gene frequency in a random mating population in equilibrium. Non-directional, mutations are.
Hugo de Vries conducted experiments on Evening Primrose and when he self-pollinated the plants from the ${ F }_{ 1 }$ generation. Although most plants are similar to parents, he found that there were a few different plants that appeared at random, in which inherited characters unexpectedly appeared in the race without any prior hint. On this basis, he gave the theory of mutation,
Suddenly, mutations arise but quickly become operational.
Mutations may be inherited.
The typical characteristics of the species do not revolve around.
In the number of individuals in the population, the same type of mutations will appear.

Additional Information: Random drift is triggered by repeated small population sizes, extreme population size declines called "bottlenecks" and founding events where a small number of individuals start from a new population. In species, genetic drift contributes to the fixation of alleles or genotypes.
Selection- A mechanism in which environmental or genetic factors decide which species, known as a factor in evolution, survive better than others.
Human migration includes the transfer of people from one place to another with the intention of settling in a new location (geographic region), permanently or temporarily.
So, the correct answer is ‘mutation’.

Note: Due to the chemical instability of the purine and pyrimidine bases and errors during DNA replication, mutations occur randomly at low frequency. Mutations can also be caused by normal exposure of an organism to such environmental factors, such as ultraviolet light and chemical carcinogens (e.g., aflatoxin B1).