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Natural, Sexual and Artificial Selection

Natural, Sexual and Artificial Selection. Directional, Disruptive and Stabilizing Selection. Directional Selection. An extreme phenotype is favored A trait that was once rare becomes more common. Stabilizing Selection. An intermediate phenotype is favored There is less genetic variation

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Natural, Sexual and Artificial Selection

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  1. Natural, Sexual and Artificial Selection

  2. Directional, Disruptive and Stabilizing Selection

  3. Directional Selection • An extreme phenotype is favored • A trait that was once rare becomes more common

  4. Stabilizing Selection • An intermediate phenotype is favored • There is less genetic variation • Extreme phenotypes may be lost

  5. Disruptive Selection • Both extreme phenotypes are favored • Intermediate forms are selected against • This can lead to formation of new species

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