Genetic drift resulting from a disaster that drastically reduces population size is called

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The bottleneck effect occurs when a disaster, such as a natural disaster or disease outbreak, drastically reduces a population's size, leading to a loss of genetic diversity and an increase in genetic drift. This can result in significant changes to the genetic makeup of the population over time. Gene flow involves the movement of genes from one population to another through migration, while natural selection is the process by which certain traits become more or less common in a population based on their survival and reproductive success. The founder effect occurs when a small group of individuals separates from a larger population and starts a new population with a different genetic makeup than the original population.

Genetic Drift Resulting from a Disaster That Drastically Reduces Population