Mechanisms of Evolution Lesson

Thanks to a better food source, giraffes with longer necks were able to survive to reproduce and so passed on the characteristic to the succeeding generation.

• gene flow

• natural selection

• bottleneck effect

• founder effect

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Northern elephant seals have reduced genetic variation because of humans hunting them in the 1890s. Hunting reduced their population size to as few as 20 individuals at the end of the 19th century.

• Gene flow

• natural selection

• bottleneck effect

• founder effect.

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Which of the following statements about gene flow is TRUE?

• Gene flow is a result of individuals that breed in an old location

• Gene flow is a result of migrating individuals that breed in a new location

• Gene flow is not a result of migrating individuals that breed in a new location

• None of the statements are true

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How do evolution directly affected by the gene flow?

• It doesn’t contribute to evolution

• It introduces new alleles into a population.

• It reduces the number of members in a population.

• It changes the environment in which a population resides.

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In order for the genetic drift to occur, what is the necessary parameter?

• The population must be large.

• The population must be small.

• The population must be under environmental stress.

• The population must be sterile.

What will happen to the organisms during natural selection?

• Organisms tend to remain the same

• Organisms tend to adapt the changes

• Organisms tend to ignore the changes

• None of the statement is correct

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What should fittest individual must do in order for the evolution to occur?

• Avoid predators more successfully

• Be better at obtaining food

• Leave more offspring

• Must be sterile

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Which of the following is NOT considered a mechanism of evolution?

• Mutations

• Natural Selection

• Behavior Changes

• Genetic Drift

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What determines an organism's biological fitness?

• How strong it is

• A lack of mutations

• It's lifespan

• The number of offspring it produces

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Genetic Drift has a stronger effect on smaller populations

• True

• False