The bottlenecks effect prevents the majority of genotypes from participating in the production of the next generation.
When a calamity strikes, an environment can rapidly shift. When an event causes a significant decline in a population, it might result in a sort of genetic drift known as the bottleneck effect.
A natural event, such as an earthquake or volcano eruption, can produce this. It is now frequently caused by humans as a result of over-hunting, deforestation, and pollution.
When the majority of a population dies abruptly, genetic variation decreases, and the frequency with which different alleles are present in the population might alter dramatically. Remember that alleles are distinct variants of the same gene that are found on the same chromosome.
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