Genetic Drift and Gene Flow

In which of the following populations would genetic drift be most likely to cause a rapid evolution of the population?

• The human population of India

• A large population of Mexican free-tailed bats living in central Texas

• A geographically isolated population of 5000 green tree frogs

• A small group of 12 cheetahs living in Namibia

Genetic drift occurs most quickly in -

• small populations.

• populations with large genetic variation.

• populations with small genetic variation.

• large populations.

What is gene flow?

• The addition or removal of alleles in a population due to individuals entering or leaving one population for another

• A change in allele frequencies when a new population arises from only a few individuals

• A reduction in population caused by natural disasters, disease, hunting, etc.

• A change in the gene pool due to chance

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What is genetic drift?

• A population for which the gene frequencies do not change

• A change in allele frequencies due to selection

• The addition or removal of alleles in a population due to individuals entering or leaving one population for another

• A change in the gene pool due to chance

What mechanism of evolution occurs when allele frequencies change over generations due to random chance?

• Genetic Drift

• Mutation

• Natural Selection

• Gene Flow

Select the best answer based on the image.

• Gene Flow

• Genetic Drift

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A gene pool consists of (a)   frequencies that can change randomly through generations due to chance.

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Select all answers below that describe the founder effect.

• Changes allele frequencies

• Occurs when a new population arises from only a few individuals

• Can result in a loss of genetic diversity

• Is caused by a disaster that kills off most individuals in a population

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True of False: Evolution is the change in relative frequency of alleles in a population over time

• True

• False

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Different colors represent different varieties found in a population, Which population has a larger gene pool?

• circle on the left

• middle circle on the right

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