Chapter 24 Quiz ANS

Chapter 24 Quiz ANS - Chapter 24 Quiz 1. When gene flow...

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Chapter 24 Quiz 1. When gene flow between two populations ceases, the potential for _____ exists. a. Speciation b. Hybridization c. Fusion d. Sexual reproduction e. Sexual selection 2. Bird guides once listed the myrtle warbler and Audubon's warbler as distinct species that lived side by side in parts of their ranges. However, recent books show them as eastern and western forms of a single species, the yellow-rumped warbler. Apparently, the myrtle warbler and Audubon's warbler _____. a. have undergone coevolution b. are merging to form a single species c. are almost identical in appearance d. successfully interbreed and produce fertile offspring e. live in the same areas 3. Imagine that part of a population of South American finches is blown by a storm onto an island far offshore and manages to survive and reproduce there for a period of 10,000 years. After that period, a climate change results in lower sea levels and the reconnection of the island with the mainland. Members of the formerly isolated island finch population can now interact freely with members of the original mainland population. Which of the following observations would, by itself, lead you to conclude unequivocally that the island finch population had evolved into a distinct species, according to the biological species concept? a. I ndividuals from the different populations sometimes mate with each other, but all of the resulting eggs are sterile. b. Hybrid offspring of matings between individuals from the two populations do not look like either parent. c. The preferred food of the island birds is quite different from the diet of mainland birds. d. The island birds all have red feathers, but the mainland birds have green feathers. e. Individuals from the different populations frequently direct courtship behavior toward members of the other population. 4. Which of the following conditions is necessary for speciation to occur? a. Reproductive isolation b. Sympatric speciation c. Interbreeding among neighboring populations d. Mass extinction e. Adaptive radiation 5. At which point in the adaptation of a population is it clear that speciation has occurred? a. An allopatric separation occurs. b. Gene pool changes adapt a population to a local environment. c. Viable, fertile hybrids occur. d. Gene pool changes establish reproductive barriers between two populations. e. All of the listed responses are correct. 6. Prezygotic barriers _____. a. prevent fertilization of gametes from members of closely related species b. prevent a hybrid zygote from developing into a viable, fertile adult c. are necessary in order for speciation to occur d. prevent donkeys and horses from mating e. only occur in asexual organisms 7. Three species of frogs, Rana pipiens , Rana clamitans , and Rana sylvatica , all mate in the same ponds, but they pair off correctly because they have different calls. This is a specific example of a _____ barrier, called _____.
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Chapter 24 Quiz ANS - Chapter 24 Quiz 1. When gene flow...

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