L.15.14 - Mechanisms of Evolution

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.

• Genetic Drift
• Natural Selection
• Non-random mating
• Mutation

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Which of the following is true?

• Gene pool frequencies do not change as a result of migration in or out of a population.
• Gene flow occurs only as a result of isolation of a small population.
• Gene flow can cause new alleles to enter a population's gene pool.
• Gene flow is due the the selection of the most favorable traits.

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A population is

• a group of similar species in different areas

• a group of the same species in the same geographic area.

• a group of several species in the same geographic area

• a group of several species along with their abiotic factors in a small area.

Over the years, white mice became extinct and darker mice survived. This is

• stabilizing selection

• directional selection

• disruptive selection

• due to exercise

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Average phenotypes are favored in the environment, while extremes have lower survival rates.

• seasonal selection

• distruptive selection

• directional selection

• stabilizing selection

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All the possible gene combinations in a population.

• allele

• gene pool

• genome

• mitosis

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The extreme population phenotypes are favored by the environment.

• Disruptional (Diversifying) Selection

• Directional Selection

• Stabilizing Selection

• All of the above

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Some insects are resistant to certain pesticides, chemicals that are sprayed on crops to keep the insects from eating them. The insects that have the resistant trait are not affected by the pesticides. This resistance trait can be passed to their offspring. The resistance to pesticides that some individual insects have is a result of-

• the behavior of those insects

• the genetic makeup of those insects

• transfer of resistance from one individual insect to another

• individual insects becoming resistant over time

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A population of salamanders, 50% of whom were spotted, decreased from 500 to only 100 in just a few months when a drought dried up much of the lake they inhabit. The remaining population had a much higher frequency of spotted than non-spotted salamanders compared with the original population. The most likely cause for this change is -- 

• Natural Selection

• Gene Flow

• Mutation

• Genetic Drift

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61% accuracy: In rock pocket mice, for thousands of years the dominant fur color is lighter colored fur. Occasionally a mouse will be born with a change in the MC1R gene, which causes a darker fur color. This change is an example of a(n)...

• gene flow

• natural selection

• mutation

• artificial selection

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