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Published byPolly Boone Modified over 5 years ago
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The student is expected to: 7C analyze and evaluate how natural selection produces change in populations, not individuals; 7D analyze and evaluate how the elements of natural selection, including inherited variation, the potential of a population to produce more offspring than can survive, and a finite supply of environmental resources, result in differential reproductive success;
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(Continued) 7E analyze and evaluate the relationship of natural selection to adaptation and to the development of diversity in and among species;
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KEY CONCEPT Populations, not individuals, evolve.
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Natural selection acts on distributions of traits.
A normal distribution graphs as a bell-shaped curve. highest frequency near mean value frequencies decrease toward each extreme value Traits not undergoing natural selection have a normal distribution.
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Natural selection can change the distribution of a trait in one of three ways.
Microevolution is evolution within a population. observable change in the allele frequencies can result from natural selection
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Natural selection can take one of three paths.
Directional selection favors phenotypes at one extreme.
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Natural selection can take one of three paths.
Stabilizing selection favors the intermediate phenotype.
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Natural selection can take one of three paths.
Disruptive selection favors both extreme phenotypes.
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