Genetic Drift vs Gene Flow Lesson

A forest fire ignites and kills many members of a population of rattlesnakes. This is an example of:

• gene flow

• genetic drift

• mutation

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NGSS.HS-LS4-5

A forest fire ignites in the Sam Houston State Forest and kills many members of a population of pigmy rattlesnakes.

• Gene Flow

• Genetic Drift

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NGSS.HS-LS4-5

A few deer wander out of their native woods into a completely new park where no deer had ever been before. They go on to create an entirely new population.

• gene pool 

• founder effect

• bottleneck

• mutation

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NGSS.HS-LS4-5

Match the following

• Usually decreases genetic variation

• Mutation

• Population gets smaller (Natural Disaster)

• Genetic Drift

• Change in DNA sequence

• Gene Flow

• Increases genetic variation

• Founders Effect

• Starting a new population

• Bottle Neck

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NGSS.HS-LS4-2

During a hurricane, a population of beetles almost gets completely wiped out. The only beetles that survived were lucky that they were in their nest at the time of the hurricane and had enough food to survive.

• Natural selection

• Genetic Drift

• Gene Flow

• Non-Random Mating

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NGSS.HS-LS4-5

NGSS.HS-LS4-2

NGSS.HS-LS4-4

A certain type of plant can produce blue or yellow flowers. During a fire, many yellow flowers are destroyed and now since blue is the dominant trait, the plant reproduces offspring that produce only blue flowers.

• Non-Random Mating

• Gene Flow

• Mutation

• Genetic Drift

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NGSS.HS-LS4-5

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NGSS.HS-LS4-4

This is one of the mechanisms of evolution; it occurs when individuals move into or out of a population, either by physically arriving or leaving, or by being born or dying

• Gene flow / genetic drift

• Founder effect

• Natural selection

• Microevolution

Which of the following best describes genetic drift?

• A random change in allele frequencies in a population

• The movement of alleles between populations

• The introduction of new alleles through mutation

• The selection of advantageous traits

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NGSS.HS-LS4-2

Gene flow is primarily caused by:

• Random mutations

• Natural selection

• Migration of individuals between populations

• Genetic recombination

A small group of birds is blown off course and settles on an isolated island, leading to a new population. This is an example of:

• Gene flow

• Genetic drift

• Founder effect

• Bottleneck effect