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The bottleneck is caused by ...*1 pointGenetic driftGene flowNatural selectionMutations

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Solution

The bottleneck is caused by Genetic drift.

Here's a step-by-step explanation:

  1. A population bottleneck is an event that drastically reduces the size of a population.

  2. This can be caused by various events like natural disasters, hunting, habitat loss, etc.

  3. When the population size is reduced, the genetic variation of the population also decreases.

  4. This is because only a small number of individuals from the original population survive and pass on their genes to the next generation.

  5. This process is known as genetic drift, where allele frequencies change due to random sampling of organisms.

  6. Therefore, the bottleneck is caused by Genetic drift.

Note: While gene flow, natural selection, and mutations can also affect the genetic diversity of a population, they are not the direct causes of a bottleneck.

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