Genetic drift is a change in the gene pool due to chance. Genetic drift increases as the population decreases. What accounts for this relationship?

Genetic drift is a change in the gene pool by chance of a Population as a result of sampling error that occur over generation.

Genetic drift is a random process that can lead to changes in large Population over short period of time. This random drift is caused by recurring small population sizes, reduction in small population called bottleneck. Genetic drift fixes alleles or phenotype in a population there by increasing inbreeding coefficient and homozygosity as a result of of removing alleles. This result in decrease in population.