Question 13 of 33
3.0 Points
What does the famous quote from Theodosius Dobzhansky “Nothing makes sense in biology except in the light of evolution”?
A. This quote means that the thermodynamic principles that govern light are important to how organisms have diversified over time.
B. This quote means that all other questions in biology are tied together by the diversification over time from a common ancestor.
C. This quote means that many questions about evolution are still being answered so we should seek to understand those first.
D. This quote means that since every species eventually goes extinct we must try to understand biology before this happens.
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Question 14 of 33
3.0 Points
How did Darwin define evolution?
A. descent with modification
B. change in allele frequency over time
C. adaptation to climate
D. inheritance of acquired characteristics
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Question 15 of 33
3.0 Points
Homologous structures:
A. evolve from a common ancestor.
B. result from divergent evolution.
C. occur in unrelated species.
D. are a result of the bottleneck effect.
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Question 16 of 33
3.0 Points
What are the four evolutionary forces that would disrupt population Hardy-Weinberg equilibrium?
A. migration, mutation, genetic drift, and natural selection
B. sexual selection, natural selection, competition, and convergence
C. behavior, non-assortative mating, divergence, and equilibrium
D. photosynthesis, cellular respiration, behavior, and mutation
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Question 17 of 33
3.0 Points
What is an example of gene flow?
A. In a population flowers that carry purple alleles are pollinated more often.
B. A new purple allele arises in the population by mutation.
C. Purple alleles are introduced into population by migration.
D. Purple alleles result in allopatric speciation.
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Question 18 of 33
3.0 Points
A population of pocket mice has two coat colors: black and brown. There are more black mice on lava rocks where there are hawk predators. This is an example of:
A. Mutation
B. Genetic drift
C. Macroevolution
D. Natural selection
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Question 19 of 33
3.0 Points
What is the change in a population’s allele frequency from one generation to the next that is due to chance known as?
A. mutation
B. natural selection
C. genetic drift
D. migration
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Question 20 of 33
3.0 Points
Which statement best describes analogous structures?
A. cause increased mutation
B. occur in unrelated species
C. evolve from a common ancestor
D. result from divergent evolution
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Question 21 of 33
3.0 Points
Which of the following is accurate about mutation?
A. Mutation causes gene flow between populations.
B. Mutation results from bottleneck events.
C. Mutation alone is a strong mechanism of evolution.
D. Mutation is the ultimate source of novel variation.
Feedback: Although there are many processes that can change allele frequencies in a population, only mutation can result in new variation. Read more in Chapter 11.
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Question 22 of 33
3.0 Points
Which is an example of genetic drift?
A. Ten butterflies that are migrating get swept off course and start a new island population.
B. Finches with large beaks survive and reproduce more after a drought.
C. Snakes on an island that are unbanded survive better than banded snakes because they avoid predation.
D. A bee pollinates purple or yellow orchids dependent on the frequency of the flower color in the population.
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Question 23 of 33
3.0 Points
What is one of the three principles that results in natural selection?
A. Individuals in a population have the same ability to survive and reproduce.
B. Resources are unlimited and arise from the endless supply of energy from the sun.
C. Characteristics are inherited from parent to offspring.
D. Inheritance of acquired characteristics creates a strong evolutionary force.
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Question 24 of 33
3.0 Points
A classic scientific study showed that crayfish on one side of the isthmus of Panama were more closely related to other species on the other side of the isthmus than to each other. The most likely explanation for this result is:
A. dispersal
B. gene flow
C. mutation
D. vicariance
Feedback: The most likely explanation is that a several separation crayfish species were separated by the formation of the isthmus and the then separated populations diverged. Read more in Chapter 11.
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