17.2 Evolutionary Genetics Quiz

Which of the following best describes natural selection?

• The random change in allele frequencies in a population

• The process by which organisms better adapted to their environment tend to survive and produce more offspring

• The movement of genes from one population to another

• The formation of new species due to reproductive isolation

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DOK Level 2: Skill/Concept

Explain how genetic drift can affect small populations differently than large populations.

• Genetic drift has a larger impact on small populations because random events can significantly alter allele frequencies.

• Genetic drift affects large populations more because there are more alleles to change.

• Genetic drift does not affect populations of different sizes differently.

• Genetic drift only affects populations that are geographically isolated.

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DOK Level 3: Strategic Thinking

What is gene flow?

• The random change in allele frequencies in a population

• The process by which organisms better adapted to their environment tend to survive and produce more offspring

• The movement of genes from one population to another

• The formation of new species due to reproductive isolation

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DOK Level 2: Skill/Concept

Describe how reproductive isolation can lead to speciation.

• Reproductive isolation prevents gene flow between populations, leading to the accumulation of genetic differences that can result in the formation of new species.

• Reproductive isolation increases gene flow between populations, leading to the formation of new species.

• Reproductive isolation decreases genetic variation within a population, preventing speciation.

• Reproductive isolation has no effect on speciation.

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DOK Level 3: Strategic Thinking

Which of the following is an example of a mutation?

• A change in the frequency of an allele in a population

• A change in the DNA sequence of an organism

• The movement of individuals from one population to another

• The formation of a new species

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DOK Level 2: Skill/Concept

How do mutations contribute to genetic variation?

• Mutations decrease genetic variation by eliminating alleles.

• Mutations increase genetic variation by introducing new alleles into a population.

• Mutations have no effect on genetic variation.

• Mutations only affect genetic variation in large populations.

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DOK Level 2: Skill/Concept

Analyze the role of selective pressures in natural selection.

• Selective pressures are environmental factors that favor certain traits over others, leading to changes in allele frequencies in a population.

• Selective pressures are random events that change allele frequencies in a population.

• Selective pressures decrease genetic variation by eliminating alleles.

• Selective pressures have no effect on natural selection.

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DOK Level 3: Strategic Thinking

What is the Hardy-Weinberg principle?

• A principle that describes the movement of genes from one population to another

• A principle that states allele frequencies in a population will remain constant in the absence of evolutionary influences

• A principle that explains the formation of new species due to reproductive isolation

• A principle that describes the random change in allele frequencies in a population

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DOK Level 2: Skill/Concept

Evaluate the impact of environmental factors on allele frequencies in a population.

• Environmental factors can lead to changes in allele frequencies by favoring certain traits that are better adapted to the environment.

• Environmental factors have no impact on allele frequencies in a population.

• Environmental factors decrease genetic variation by eliminating alleles.

• Environmental factors only affect allele frequencies in small populations.

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DOK Level 3: Strategic Thinking

Which of the following is an example of genetic drift?

• A population of birds migrates to a new island and interbreeds with the local population.

• A natural disaster randomly kills a large portion of a population, changing the allele frequencies.

• A mutation introduces a new allele into a population.

• A population evolves due to selective pressures favoring certain traits.

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DOK Level 2: Skill/Concept