Some local populations, and occasionally entire species, have reduced genetic diversity because their populations were severely reduced in the past. This is called a

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A genetic bottleneck occurs when a population's size is significantly reduced for at least one generation, leading to a loss of genetic diversity. This can happen due to natural disasters, disease, or human activities, and can affect the population's ability to adapt to future environmental changes.

Some Local Populations, and Occasionally Entire Species, Have Reduced Genetic