A bottleneck effect occurs when a population's size is significantly reduced for at least one generation, and then the population size rebounds. The genetic diversity of the population is reduced because only a small number of individuals contribute genes to the next generation. This leads to a population with limited genetic variation from the original population that survived the bottleneck.

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A Bottleneck Is When

Question 40

Multiple Choice

A bottleneck is when

A) there is a dramatic reduction in population numbers, followed by a further decrease in the population such that the resulting small population has only the limited variation from the original population that made it through the bottleneck.
B) there is a dramatic reduction in population numbers, followed by an increase in the population such that the resulting large population has only the limited variation from the original population that made it through the bottleneck.
C) there is a dramatic increase in population numbers, followed by a further increase in the population such that the resulting large population has the variation from the original population that made it through the bottleneck.
D) there is a dramatic increase in population numbers, followed by a decrease in the population such that the resulting population has only the limited variation from the population that made it through the bottleneck.

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