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Mechanisms of Evolution Terms

Mechanisms of Evolution Terms

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Tags: science   biology   high school   cusd   evolution   ngss   terms   hs-ls4-1   hs-ls3-3   mechanism  

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Gene Pool
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The set of all genes, or genetic information, in any population, usually of a particular species.
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Allele Frequency
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How likely it is to find an allele in a population; calculated as a ratio of the number of a specific allele to the total number of alleles for that gene in a population.
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Normal Distribution
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Highest frequency is near mean & shape is bell curve.
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Microevolution
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Observable evolutionary changes within a species or small group of organisms, especially over a short period of time.
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Directional Selection
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Selection that favors one extreme variation of a trait.
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Stabilizing Selection
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Selection that favors the most common trait.
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Disruptive Selection
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Selection that favors the extreme variations of a trait.
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Gene Flow
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The transfer of alleles or genes from one population to another, usually through migration of organisms.
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Genetic Drift
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Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.
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Bottleneck Effect
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A sharp reduction in the size of a population due to destructive environmental events (such as earthquakes, floods, fires, or droughts).
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Founder Effect
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A type of genetic drift that occurs when a small group of organisms (of the same species) colonize a new territory.
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Sexual Selection
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Natural selection arising through preference by one sex for certain characteristics in individuals of the other sex.
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