Lesson 50: Gene Flow and Genetic Drift

The _________________ _________________ occurs when there is a reduction in population due to natural disasters, over hunting or disease.

• founder effect

• gene flow

• bottleneck effect

• genetic drift

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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

As a population recovers from reduction due to the bottleneck effect, the population will experience -

• a loss of genetic dicversity.

• migration.

• no change to allele frequency.

• genetic regulation.

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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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A widespread occurrence of disease is called a(n) ______________.

• allele frequency

• natural disaster

• bottleneck effect

• epidemic

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

Which of the following could not be a possible cause of the bottleneck effect?

• Overhunting of northern elephant seals

• A forest fire that destroys most of a population of deer

• A crop that is destroyed by blight

• A small group of fish that are added to a pond

Tags

NGSS.HS-LS4-5

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

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

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