Genetic drift is the in allele frequencies from generation to generation and is especially influential in populations.
a) change due to selection; small
b) random change; small
c) change due to selection; large
d) random change; large

B) random change; small

Explanation:

Genetic drift refers to the change in the allele frequencies of a population by a chance event. It does not include natural selection for adaptive features. Genetic drift occurs when accidental and chance events change the allele frequencies of the population. It is more effective in small populations which in turn are more likely to exhibit sampling or handling errors.

Genetic drift tends to fix an allele irrespective of its harmful, beneficial or neutral effect on the population and thereby, increases homozygosity in the population. The population exhibits lesser genetic variations. For example, the founder effect is a genetic drift that occurs when a few individuals from the original population colonize new habitat.

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