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Related Flashcards
Cards In This Set
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A change in allelic frequencies in a population that is due to chance.
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Genetic drift
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Removes individual traits with average trait values, creating two populations with extreme traits.
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Disruptive selection
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The most common form of selection, which removes organisms with extreme expressions of a trait.
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Stabilizing selection
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Occurs when a small sample of the main population settles in a location separated from the main population.
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Founder effect
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When a species evolves into a new species without any barriers that separate the populations.
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Sympatric speciation
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Will shift populations toward a beneficial but extreme trait value.
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Directional selection
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A population is divided by a barrier; each population evolves separately, and eventually the two populations cannot successfully interbreed.
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Allopatric speciation
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A change in the size or frequency of a trait, based on competition for a mate.
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Sexual selection
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One species will sometimes diversify in a relatively short time into a number of different species in a pattern called
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Adaptive radiation
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The idea that evolution occurred in small steps over millions of years in a speciation model is currently known as.
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Gradualism
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Allele frequencies remain the same unless acted upon by a factor
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Hardy-Weinberg principle
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Random evolution that occurs in a small, separate population.
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Founder effect
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Change in the allele frequencies in a population by chance.
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Genetic drift
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Selection which shifts a population toward an extreme trait.
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Directional selection
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Selection which removes individuals with average traits.
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Disruptive selection
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