Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 41.1, Problem 3CC
MAKE CONNECTIONS Figure 22.13 illustrates how a hybrid zone can change over time. Imagine that two finch species colonize a new island and are capable of hybridizing (mating and producing viable offspring). The island contains two plant species, one with large seeds and one with small seeds, growing in isolated habitats. If the two finch species specialize in eating different plant species, would reproductive barriers be reinforced, weakened, or unchanged in this hybrid zone? Explain.
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Chapter 41 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 41.1 - Explain how interspecific competition, predation,...Ch. 41.1 - According to the principle of competitive...Ch. 41.1 - MAKE CONNECTIONS Figure 22.13 illustrates how a...Ch. 41.2 - What two components contribute to species...Ch. 41.2 - How is a food chain different from a food web?Ch. 41.2 - WHAT IF? Consider a grassland with five trophic...Ch. 41.2 - MAKE CONNECTIONS Rising atmospheric CO2 levels...Ch. 41.3 - Why do high and low levels of disturbance usually...Ch. 41.3 - During succession, how might the early species...Ch. 41.3 - WHAT IF? Most prairies experience regular fires,...
Ch. 41.4 - Describe two hypotheses that explain why species...Ch. 41.4 - Describe how an islands size and distance from the...Ch. 41.4 - WHAT IF? Based on MacArthur and Wilsons island...Ch. 41.5 - What are pathogens?Ch. 41.5 - Prob. 2CCCh. 41 - The feeding relationships among the species in a...Ch. 41 - Prob. 2TYUCh. 41 - Prob. 3TYUCh. 41 - Community 1 contains 100 individuals distributed...Ch. 41 - Prob. 5TYUCh. 41 - SCIENTIFIC INQUIRY An ecologist studying plants in...Ch. 41 - FOCUS ON EVOLUTION Explain why adaptations of...Ch. 41 - FOCUS ON INFORMATION In Bateslan mimicry, a...Ch. 41 - SYNTHESIZE YOUR KNOWLEDGE Describe two types of...
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- How can researchers test the hypothesis that clinal variation among populations of a particular species has a genetic basis?arrow_forwardWHAT IF? Consider two species that diverged whilegeographically separated but resumed contact beforereproductive isolation was complete. Predict the outcome over time if the two species mated indiscriminately and (a) hybrid offspring survived and reproducedmore poorly than offspring from intraspecific matingsor (b) hybrid offspring survived and reproduced as wellas offspring from intraspecific matings.arrow_forwardMAke ConneCtIonS Suppose that a sudden changein environmental conditions caused a substantial dropin a population’s carrying capacity. Predict how naturalselection and genetic drift might affect this population.(See Concept 23.3.)arrow_forward
- 1. Describe two types of interactions between two competing species. 2. Explain how potentially competing species may co-exist. 3. Explain resource partitioning. Give an example. 4. Discuss the co-evolution of predator defences. 5. What is mutualism? Discuss in the context of coevolution. 6. Explain optimal foraging 7. Explain the Red Queen view of evolution 8. Explain one problem related to the concept of coevolution. Give an example. 9. What are the 4 examples of social behaviour among species according to Herron and freeman (2015). Discuss one example of each type of interaction.arrow_forwardQuestion:- Identify at least 4 different cause that are used by migratory animals to find their way during migration. Then, pick one of the cause and explain how we know that at least one species or organism uses these cues.arrow_forwardReview why you might see a cline across a geographical area. Explain why you are more likely to see a cline when there is gene flow between populations. What could happen if the gene flow becomes restricted across a cline? Explain.arrow_forward
- MAKE CONNECTIONS Commercial fisheries targetolder, larger cod fish, causing cod that reproduce at ayounger age and smaller size to be favored by naturalselection. Younger, smaller cod have fewer offspring thando older, larger cod. Predict how evolution in responseto fishing would affect the ability of a cod populationto recover from overfishing. What other reciprocal ecoevolutionary effects might occur? (See Concept 23.3.)arrow_forwardHow would you predict an evolutionary shift from horizontal to vertical transmission of a symbiont in a mutualism would affect the following: 1) partner dependence, 2) partner fitness conflict, and 3) partner genomes. Clearly explain the logic behind your predictions How would you predict an evolutionary shift from horizontal to vertical transmission of a symbiont in a mutualism would affect the following: 1) partner dependence, 2) partner fitness conflict, and 3) partner genomes. Clearly explain the logic behind your predictionsarrow_forwardHow can indirect development lead to greater levels of species diversity?arrow_forward
- Describe how pre-zygotic, post-mating and post-zygotic isolation mechanism lead to variation and eventual speciation.arrow_forwardMAKE CONNECTIONS Balancing selection can maintain variation at a locus (see Concept 23.4). Based on theforaging experiments described in this chapter, devise asimple hypothesis to explain the presence of both for Rand forsalleles in natural fly populationsarrow_forwardEVOLUTION CONNECTION Explain why adaptations ofparticular organisms to interspecific competition may notnecessarily represent instances of character displacement. Whatwould a researcher have to demonstrate about two competingspecies to make a convincing case for character displacement?arrow_forward
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