Definition of Genetic bottleneck
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Genetic bottleneck Definition from Encyclopedia Dictionaries & Glossaries
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A population bottleneck is a sharp reduction in the size of a population due to environmental events (such as earthquakes, floods, fires, or droughts) or human activities (such as genocide). Such events can reduce the variation in the gene pool of a population. After an event, a smaller population (of animals/people), with a correspondingly smaller genetic diversity, remains to pass on genes to future generations of offspring. Genetic diversity remains lower, only slowly increasing with time as random mutations occur. In consequence of such population size reductions and the loss of genetic variation, the robustness of the population is reduced; the ability of the population to survive selecting environmental changes like climatic change or a shift in available resources, is reduced.
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