Chapter 6 Flashcards
Why is it essential that traits be inherited for evolution to occur?
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The insecticide DDT has been widely used to control the mosquitoes that carry malaria. How would you explain the fact that many mosquito populations are now resistant to DDT?
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What are the sources of genetic variation, and why is genetic variation important to evolution?
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Compare and contrast evolution by artificial selection with evolution by natural selection.
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How should stabilizing selection and disruptive selection affect the magnitude of phenotypic variation from one generation to the next?
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Suppose that rapid environmental change- for example, change caused by human activities- exerts very strong selection on a population. Contrast the changes that one might observe in allele frequencies and in population size.
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Individual cactus wrens orient their nests in one direction during the cool spring months, but in a different direction during the hot summer months. What does this observation suggest about the kinds of traits that selection has acted on during the evolution of behavior?
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Why are organisms living in variable environments more likely to evolve phenotypically plastic traits than organisms living in relatively constant environments?
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