Question

What must conditions be like for genetic drift to have a strong effect on allele frequency?

Answer 1

Genetic drift is a change in allele frequencies in a population from generation to generation that occurs due to chance events.

conditions in which genetic drift can have a strong impact on allele frequencies is whe the population size is low.

Just like when a small population divides from the main group in search of a new colony , the allele frequencies get disturbed at a high rate.

Also when , the population size is too small and it faces natural disasters which will kill a lot of population from the group leaving behind a small and random assortments of population. This condition is otherwise known as bottleneck effect which affects the allele frequencies to a great extent.