The bottleneck effect is thought to be responsible for the loss of genetic variability in a species.

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The bottleneck effect occurs when a population undergoes a significant reduction in its size, which can drastically reduce the genetic diversity of the population. This is because the surviving individuals may only have a subset of the genetic variations that were present in the original population, and over time, this reduced genetic variation can become more prevalent in the population.

The Bottleneck Effect Is Thought to Be Responsible for the Loss