Genetic drift is the frequency change in the variant. It is a change in the allele frequency of a population due to random sampling chance. Thus, option a is correct.
What is genetic drift?
Genetic drift is the change in the frequency of the gene variant in the existing population because of random chances and events. It eliminates or decreases the variant type.
When the allele of the variant increases or decreases over time it causes genetic drift. It may lead to change in a population over time and can be due to migration, selection, etc.
Therefore, the genetic drift is due to random chances.
Learn more about genetic drift here:
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