Genetic Drift

Genetic drift is a fundamental concept in the study of biological diversity within human populations. It refers to the random changes in allele frequencies in a population over time due to chance events rather than natural selection. Unlike natural selection, where the fitness of traits determines their frequency in the population, genetic drift occurs randomly and can lead to significant changes in genetic diversity, particularly in small populations. This process can have profound effects on the genetic makeup of human populations, influencing the distribution of genetic traits and contributing to the overall biological diversity seen across different human groups.

Genetic drift is most pronounced in small populations. In these populations, chance events such as the random survival of individuals or the random inheritance of alleles can drastically alter allele frequencies. For example, if a small group of individuals in a population is affected by a random event like a natural disaster, certain alleles may become more or less common simply due to the individuals who survive and reproduce. This random sampling effect can reduce genetic variation, as certain alleles may be lost entirely from the gene ______ _____ _________ __________ ___ __________ __________ ________ _______ __________.
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