Types of Selection

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What is Disruptive Selection?

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A type of natural selection that favors extreme phenotypes over intermediate phenotypes, leading to a decrease in the average trait in a population.

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What is Directional Selection?

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A type of natural selection that favors one extreme phenotype, causing the allele frequency to shift in one direction.

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What is Artificial Selection?

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The process by which humans select for desirable traits in organisms, allowing only those with specific traits to breed.

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What is Stabilizing Selection?

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A type of natural selection that favors average phenotypes and reduces variation in a trait.

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What is an example of Disruptive Selection?

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In a population of finches, both very large and very small beaks are favored, while average-sized beaks are not.

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What is an example of Directional Selection?

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In a population of peppered moths, darker moths are favored in polluted environments, leading to an increase in the frequency of dark-colored moths.

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What is an example of Artificial Selection?

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Breeding dogs for specific traits, such as size or coat color, is an example of artificial selection.

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What is the difference between Natural Selection and Artificial Selection?

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Natural selection occurs through environmental pressures, while artificial selection is driven by human choices.

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What is the role of environmental conditions in Disruptive Selection?

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Environmental conditions that favor extreme traits can lead to disruptive selection by creating niches for those traits.

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What is the impact of Stabilizing Selection on a population?

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Stabilizing selection reduces variation and maintains the status quo for a particular trait.