Hello
Genetic drift(also known as allelic drift or the Sewall Wright effect) is the change in the frequency of an existing gene variant  (allele) in a population due to random sampling of organisms. The alleles in the offspring are a sample of those in the parents, and chance has a role in determining whether a given individual survives and reproduces
When there are few copies of an allele, the effect of genetic drift is larger, and when there are many copies the effect is smaller.

Goodluck I hope this information helps you