The bottleneck effect occurs when a population size is reduced for at least one generation. Undergoing a bottleneck can greatly reduce the genetic variation a population, leaving it susceptible to extinction if it is unable to adapt to climatic changes, or changes in resource or availability. Small populations are especially at risk when a bottleneck occurs, caused by the greater effect ..... can have on small populations.

EVOLUTION OF A POPULATION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

The bottleneck effect occurs when a population size is reduced for at least one generation. Undergoing a bottleneck can greatly reduce the genetic variation a population, leaving it susceptible to extinction if it is unable to adapt to climatic changes, or changes in resource or availability. Small populations are especially at risk when a bottleneck occurs, caused by the greater effect ____ can have on small populations.

A	Migration
B	Natural selection
C	Genetic drift
D	Mutation

Explanation:

Detailed explanation-1: -The bottleneck effect occurs when a population’s size is reduced for at least one generation. Undergoing a bottleneck can greatly reduce the genetic variation in a population, leaving it more susceptible to extinction if it is unable to adapt to climactic changes or changes in resource availablility.

Detailed explanation-2: -A genetic bottleneck occurs when a population is greatly reduced in size. The bottleneck limits the genetic diversity of. the species because only a small part of the original population survives.

Detailed explanation-3: -A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as specicide, widespread violence or intentional culling, and human population planning.

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