Campbell Essential Biology (7th Edition)
7th Edition
ISBN: 9780134765037
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Chapter 13, Problem 13PS
Interpreting Data A population of snails has recently become established in a new region. The snails are preyed on by birds that break the snails open on rocks, cat the soft bodies, and leave the shells. The snails occur in both striped and unstriped forms. In one area, researchers counted both live snails and broken shells. Their data are summarized here:
| Striped Shells | Unstriped Shells | |
| Number of live snails | 264 | 296 |
| Number of broken snail shells | 486 | 377 |
| Total | 750 | 673 |
Based on these data, which snail form is subject to more predation by birds? Predict how the frequencies of striped and unstriped individuals might charge over time.
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Imagine three islands, each with a population of frogs. There are approximately 1,100 frogs on Island 1, 400 on Island 2, and 400 on Island 3. Researchers estimate that these populations have been separated for 800 years. Individuals in these populations show variation in markings on their body by shape and color. Frogs on Islands 1 and 2 have circle markings that are either red, blue, or purple. All frogs on Island 3 have yellow triangle markings.
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Chapter 13 Solutions
Campbell Essential Biology (7th Edition)
Ch. 13 - Place these levels of classification in order from...Ch. 13 - Which of the following is a true statement about...Ch. 13 - How did the insights of Lyell and other geologists...Ch. 13 - In a population with two alleles for a particular...Ch. 13 - Define fitness from an evolutionary perspective.Ch. 13 - Prob. 6SQCh. 13 - As a mechanism of evolution, natural selection can...Ch. 13 - Prob. 8SQCh. 13 - In a particular bird species, individuis with...Ch. 13 - Prob. 10IMT
Ch. 13 - Prob. 11IMTCh. 13 - For each statement, identify which major theme is...Ch. 13 - Interpreting Data A population of snails has...Ch. 13 - Imagine that the presence or absence of stripes or...Ch. 13 - To what extent are people in a technological...Ch. 13 - What plants and animals have you seen near your...
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