Evolution Concepts

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Adaptation

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A process of change in which an organism becomes better suited (adapted) to its environment.

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Evolution

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The changes of species over time.

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Variation

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The different ways that traits are expressed in a population.

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Stabilizing Selection

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A type of natural selection that favors average individuals in a population.

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Observable Trait

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Natural selection functions on the observable traits of species.

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Natural Selection

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The process by which organisms better adapted to their environment tend to survive and produce more offspring.

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Fitness

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The ability of an organism to survive and reproduce in its environment.

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Biogeography

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The study of the distribution of species and ecosystems in geographic space and through geological time.

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Directional Selection

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A type of natural selection that favors one extreme phenotype over the mean or other extreme phenotypes.

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Disruptive Selection

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A type of natural selection that favors extreme values of a trait over intermediate values.