The population which have recovered today show very little genetic variations. Two forms of genetic drift are the founder effect and the bottleneck effect. A few individuals from large population groups relocated to these islands, and as the islands migrated farther from the main land, the colonizing populations became more isolated. Genetic drift is the mechanism of evolution that causes a change in the allelic frequencies of a population as a matter of chance. In 1814, a small population of British colonists founded a new colony on a group of islands in the Atlantic Ocean. The new population formed does not interact and mate with the original population. Genetic drift. It occurs in very small populations but its effects are strong. Whereas, natural selection is a type of large-scale macroevolution. There are no environmental influences that cause genetic drift to occur. Types of genetic drift. There are many species that are found only on a particular island. 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. Genetic drift might eliminate one of the beak sizes from the population, thus reducing the genetic variations of the gene pool of birds. Genetic drift is a term that refers to changes in allele frequencies. Genetic drift. The founder effect is when a few individuals in a population colonize a new location that's separate from the old population. 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