Mechanisms of Evolution

Which type of selection is NOT included in the four types of natural selection discussed?

• A) Stabilizing

• B) Directional

• C) Disruptive

• D) Random

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What is the most common form of natural selection?

• Disruptive selection

• Stabilizing selection

• Directional selection

• Balancing selection

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When does directional selection occur?

• When an extreme version of a trait makes an organism less successful

• When an extreme version of a trait makes an organism more successful

• When all traits are equally successful

• When no traits are successful.

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What can cause the distribution of traits in a population to change?

• Stable environmental conditions

• Changing environmental conditions

• Lack of environmental conditions

• Constant environmental conditions

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What is directional selection?

• A process where average traits are favored

• A process where extreme traits are favored

• A process where no traits are favored

• A process where all traits are favored.

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What is directional selection?

• A process that moves a trait in one direction along continuous variation

• A process that eliminates all variations

• A process that maintains the status quo

• A process that moves a trait in both directions along continuous variation

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Which of the following best describes the effect of directional selection on a population?

• Stabilizes the population

• Increases genetic diversity

• Favors one extreme of a trait

• Eliminates all extremes

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Which direction does directional selection pressure move a trait?

• In both directions

• In one of the two possible directions

• In no direction

• In a random direction.

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What happens to a population under disruptive selection?

• It becomes more uniform

• It splits into two groups

• It becomes extinct

• It remains unchanged

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Nonrandom mating affects a population by:

• Increasing genetic diversity.

• Decreasing genetic diversity.

• Selecting mates based on specific traits.

• Introducing new alleles.