Evolution Of Populations

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1. Albinism is due to a homozygous recessive condition. If the frequency of the allele for this condition is 0.06 in a certain Native American population, what is the frequency of the dominant allele? (Assume that the population is in Hardy-Weinberg equilibrium.)

0.04

0.06

0.16

0.36

0.94

About This Quiz

This quiz is designed to assess your understanding of how populations evolve.

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2. In a small group of people living in a remote area, there is a high incidence of "blue skin," a condition that results from a variation in the structure of hemoglobin. All of the "blue-skinned" people can trace their ancestry to one couple, who were among the original settlers of this area. The unusually high frequency of "blue skin" in this area is an example of

Mutation.

Genetic drift.

Natural selection.

Sexual selection.

Heterozygote advantage.

3. Toads in a particular population vary in size. A scientist observes that in this population, large males mate with females significantly more often than small males do. All of the following are possible reasons for this EXCEPT:

Females select large males more often than small males as mates.

Large males are successful in competing for mates more often than small males are.

Large males occupy more breeding territory than small males do.

The calls produced by large males are more attractive to females than the calls made by small males.

4. Which of the following best describes the effect of genetic drift on the gene frequencies of a population?

Genes enter a population through immigration, thus changing gene frequencies.

Genes leave a population through emigration, thus changing gene frequencies.

Chance alone can cause significant changes in gene frequencies of small populations.

Mutations over time cause gene frequencies to change.

Selection against one allele causes gene frequencies to change.

5. Although the seal and the penguin both have streamlined, fishlike bodies with a layer of insulating fat, they are not closely related. This similarity results from

Convergent evolution.

Adaptive radiation.

Homologous evolution.

Coevolution.

Parallel evolution.

6. All of the following provide evidence for evolution EXCEPT:

Vestigial structures

Darwin's finches

Homologous structures

Embryology

Mutations

7. Which of the following is NOT part of Darwin's theory of evolution by natural selection?

Evolution is a gradual process that occurs over long periods of time.

Variation occurs among individuals in a population.

Individuals that possess the most favorable variations have the best chance of reproducing.

More individuals are born than will survive.

Mutations are the ultimate source of genetic variation.

8. Which of the following is NOT a requirement for natural selection to occur?

Variation between individuals

Heritability of the trait being selected

Sexual reproduction

Differences in reproductive success among individuals

Survival of the fittest

9. In a sample population in Hardy-Weinberg equilibrium, the frequency of a recessive allele for a certain trait is 0.20. What percentage of the individuals in the next generation would be expected to show the dominant trait?

16%

32%

64%

96%

10. The wing of a bat, the flipper of a whale, and the forelimb of a horse appear very different, yet detailed studies reveal the presence of the same basic bone pattern. These structures are examples of

Analogous structures.

Homologous structures.

Vestigial structures.

Balanced polymorphism.

Convergent evolution.

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