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Speciation

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Animation: Speciation

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Animation Assessment

Question 1 of 6

Indicate whether natural selection, if it acted alone, could cause changes in the allele frequency(ies) of a population.

Question 1 choicesChoice A., Acting alone could change allele frequency.Choice B., Acting alone could not change allele frequency.

Correct.

Incorrect.

Question 2 of 6

Indicate whether genetic drift, if it acted alone, could cause changes in the allele frequency(ies) of a population.

Question 2 choicesChoice A., Acting alone could change allele frequency.Choice B., Acting alone could not change allele frequency.

Correct.

Incorrect.

Question 3 of 6

Which phrase best describes how natural selection results in evolution?

Question 3 choicesChoice A., Weak individuals are eliminated by strong individuals.Choice B., Individuals adapt to their environment by undergoing mutations.Choice C., Individuals with particular traits survive better than individuals with other traits.Choice D., Individuals with particular traits leave behind more offspring than individuals with other traits.

Correct.

Incorrect.

Question 4 of 6

In order for the gene pools of two closely related species to remain distinct, there must be:

Question 4 choicesChoice A., a geographic barrier between them.Choice B., different mutation rates in each species.Choice C., different selection pressures on each species.Choice D., some form of reproductive isolation.

Correct.

Incorrect.

Question 5 of 6

Over time, in a population, new mutations of a given gene may:

Question 5 choicesChoice A., disappear from the population.Choice B., remain at relatively low levels in the population.Choice C., become fixed as the only form of the gene in the population.Choice D., disappear, remain at low levels, or become fixed.

Correct.

Incorrect.

Question 6 of 6

A geologic barrier betwen two populations of one species can contribute to speciation because of:

Question 6 choicesChoice A., similar environmental conditions in the two locations.Choice B., lack of gene flow between populations.Choice C., increased mutation rates due to separation.

Correct.

Incorrect.

Assessment Summary

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