KEY CONCEPT Populations, not individuals, evolve.

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KEY CONCEPT A population shares a common gene pool.
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Presentation transcript:

KEY CONCEPT Populations, not individuals, evolve.

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.

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

Natural selection can take one of three paths. Directional selection favors phenotypes at one extreme.

Natural selection can take one of three paths. Stabilizing selection favors the intermediate phenotype.

Natural selection can take one of three paths. Disruptive selection favors both extreme phenotypes.

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