Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 25, Problem 7TYU
MAKE CONNECTIONS The bacterium Wolbachia is a symbiont that lives in mosquito cells and spreads rapidly through mosquito populations. Wolbachia can make mosquitoes resistant to infection by Plasmodium; researchers are seeking a strain that confers resistance and does not harm mosquitoes. Compare evolutionary changes that could occur if malaria control is attempted using such a Wolbachia strain versus using insecticides to kill mosquitoes. (Review Figure 25.26 and Concept 21.3)
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Imagine 4 hypothetical parasites that use humans as a definitive host that have evolved, in isolation, on Australia (an island). Which of the 4 (described below) would be most likely to successfully colonize Madagascar (another island, distant from Australia, and already populated by humans) if a group of 8 infected Australian humans emigrated to Madagascar?
a. A trematode that uses direct penetration to infect humans and has 3 intermediate hosts.
b. A cestode with an indirect life cycle and trophic transmission
c. An apicomplexan transmitted to humans by a biological vector.
d. A nematode with a direct life cycle and fecal-oral transmission.
Wolbachia is a genus of bacteria that infect cells of invertebrates. Surveys have found that up to a
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parasite? This endosymbiont (a symbiont that lives inside its host) bacteria can have many effects
on its host, including killing offspring and changing the sex of offspring.
Ary Hoffmann from the University of Melbourne in Australia, Michael Turelli from the University of
California at Davis, and their associates have been studying Wolbachia infections in populations of
Drosophila simulans from California. From the initial infection around 1980, Wolbachia infection
spread northward across the state during the 1980s and 1990s. The most striking manifestation of
infection in this fly species is cytoplasmic incompatibility: offspring produced in crosses where
males are infected and the females are uninfected tend to die early in development. In crosses
between infected males and infected females,…
Chapter 25 Solutions
Campbell Biology in Focus
Ch. 25.1 - Describe major events in the evolution of early...Ch. 25.1 - Explain why eukaryotes are said to be combination...Ch. 25.1 - Prob. 3CCCh. 25.2 - Summarize the evidence that choanoflagellates are...Ch. 25.2 - MAKE CONNECTlONS Describe how the origin of...Ch. 25.2 - Prob. 3CCCh. 25.3 - Briefly describe the organisms found in each of...Ch. 25.3 - MAKE CONNECTIONS Review Figures 7.2 and 8.5...Ch. 25.3 - Prob. 3CCCh. 25.3 - Prob. 4CC
Ch. 25.4 - Justify the claim that photosynthetic protists are...Ch. 25.4 - Prob. 2CCCh. 25.4 - Prob. 3CCCh. 25 - The oldest fossil eukaryote that can be resolved...Ch. 25 - Prob. 2TYUCh. 25 - Plastids that are surrounded by more than two...Ch. 25 - Prob. 4TYUCh. 25 - Prob. 5TYUCh. 25 - Based on the phylogenetic tree in Figure 25.10,...Ch. 25 - MAKE CONNECTIONS The bacterium Wolbachia is a...Ch. 25 - FOCUS ON EVOLUTION DRAW IT Medical researchers...Ch. 25 - FOCUS ON INTERACTIONS Organisms interact with each...Ch. 25 - SYNTHESIZE YOUR KNOWLEDGE These micrographs show...
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