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Chapter 17 Post-Test

This activity contains 39 questions.

Question 1
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What is an allele?
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Question 2
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What is the definition of population?
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Question 3
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Which of the following groups of organisms is subject to evolution?
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Question 4
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For scientists to analyze evolutionary change in populations, they must think of individual genes as ________.
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Question 5
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Evolution that results in the formation of new species or other large groupings of living things is defined as _____________.
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Question 6
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Which of the following could be considered a definition of evolution?
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Question 7
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A scientist notices that over a period of 10 years, spotted frogs, which were rare in a population of solid green frogs, have become almost 30 percent of the population. What phenomenon has occurred in these frogs?
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Question 8
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If a population is to undergo NO evolution, what must occur?
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Question 9
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Unlike the other mechanisms that can cause microevolution, natural selection always works in concert with ______ to make organisms more fit.
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Question 10
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On a remote Pacific island, a species of rabbits can be found that have very short, reduced ears. During a storm, a package containing live, domesticated rabbits is washed over the side of a ship and eventually washed onto the shore of the island. Within only a few generations, the population of island rabbits has changed so that 50 percent of them have short ears and 50 percent have long ears. This is an example of microevolution through ______.
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Question 11
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Along the length of a river resides a species of green sunfish. To provide electricity to area homes, a hydroelectric dam is built that separates the lower river area from a newly formed lake above. After many years, the green sunfish in the river and lake are sampled and found to be phenotypically very different. Which of the following scenarios is the best hypothesis to explain the microevolutionary changes observed?
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Question 12
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For what reason is it rather unwise for organisms to inbreed?
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Question 13
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A scientist conducting a long-term study of bluebirds in a Minnesota forest notices that the males have become a more brilliant blue over the last 30 years. Of what advantage could this be to the population?
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Question 14
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Most mutations that occur in an organism ________.
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Question 15
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Water currents, wind currents, and animal dispersal of seeds are examples of which kind of evolutionary activity?
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Question 16
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The hunting of seals in the 1890s produced which effect on their populations?
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Question 17
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The massive development we see of a peacock's tail is a good example of ________.
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Question 18
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If you were to take a population of 20 flies that have an allele frequency for w of 5 percent and killed 10 of them, what would happen to the allele frequency of w?
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Question 19
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If a small group of humans were to colonize a new planet and remain isolated, what would likely be the impact on this group's allele frequency?
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Question 20
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Which of the following evolutionary forces consistently works to adapt organisms to their environment?
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Question 21
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If an albino variant suddenly appears in a population of frogs ranging from solid green to spotted green, the new phenotype is probably the result of _________.
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Question 22
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Which of the following is one of the reasons that natural selection works on populations rather than on individuals?
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Question 23
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From an evolutionary viewpoint, the most important characteristic of a mutation is that it _______.
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Question 24
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The mutation rate in humans is______.
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Question 25
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The movement of alleles from one population to another is accomplished through _________.
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Question 26
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Why are the results of genetic drift so difficult to predict?
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Question 27
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People often see evolution as a struggle for existence and "survival of the fittest." In reality, evolution is based on __________.
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Question 28
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What did the 1970s, study on the finch G. fortis show?
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Question 29
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Which of the following is the relative ability of an organism to pass its genes on?
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Question 30
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What did the study of finches in the Galapagos show?
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Question 31
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How does natural selection increase the fitness of an organism?
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Question 32
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What did Peter and Rosemary Grant discover in their studies of Galapagos finches?
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Question 33
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Which of the following statements is true?
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Question 34
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When the environmental conditions select against organisms at only one extreme of the range of diversity in a population, the results will be ______.
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Question 35
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Why are polygenic characters particularly susceptible to the forces of natural selection?
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Question 36
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If a population of lizards that normally eat small insects expands its range into an area that has both small and large insects available, what type of natural selection would you expect to see in this population?
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Question 37
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Why do most human infants weigh less than 7 pounds at birth?
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Question 38
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If a recessive allele is found in 11 percent of a population and NO selective forces are acting on the allele, what will be its frequency in the next generation?
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Question 39
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If there are two alleles for a gene, R and r, and the frequency of the r allele is 0.72, what is the frequency of organisms that are of the Rr genotype?
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