How does genetic drift typically occur?

Genetic drift typically occurs through random sampling effects in small populations. This process results in changes to the genetic makeup of a population because, in smaller groups, allele frequencies can fluctuate significantly from one generation to the next due to chance events. For example, if a random event causes some individuals to reproduce more than others (regardless of their traits), it can lead to a loss of genetic variation over time. Unlike natural selection, where advantageous traits become more common, genetic drift is entirely due to random fluctuations that can have significant effects, especially in small populations where each individual represents a larger proportion of the genetic pool.

This concept is especially important for understanding how isolated populations can evolve independently, sometimes leading to the emergence of distinct species.