Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
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Chapter 23, Problem 2TYU

Adaptive radiations can be a direct consequence of three of the following four factors. Select the exception.

  1. A.    vacant ecological niches
  2. B.     genetic drift
  3. C.     colonization of an isolated region that contains suitable habitat and few competitor species
  4. D.    evolutionary innovation
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Which of the following is an example of gene flow? a. horizontal gene transfer b. sexual selection c. genetic drift d. mutation
Over the past several decades, natural selection has caused populations of Staphylococcus aureus (an infectious wound bacterium) to evolve resistance to most antibiotics. If antibiotic use were stopped, what would you predict would happen to these S. aureus populations?   A. Horizontal gene transfer would increase   B. The populations will begin colonizing new environments.   C. The frequency of resistant forms will definitely increase in these populations.   D. They will go extinct without the antibiotic.   E. The frequency of nonresistant forms will increase in these populations.
Adaptive radiation a. is the result of enriched uranium used in power plants. b. is the evolution of closely related species adapted to use different parts of the environment. c. results from genetic drift. d. is the outcome of stabilizing selection favoring the maintenance of adaptive traits.
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