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14 Cards in this Set
- Front
- Back
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What is CHW equilibrium?
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A null model for evolution. Castle-Hardy-Weinberg equilibrium states that under a given set of conditions, population gene frequencies do not change from one generation to the next.
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What is Directional selection?
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A type of natural selection in which individuals at one or the other end of the values for a trait are favored.
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What is Discriptive selection?
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A type of natural selection in which individuals possessing extreme valuves for a trait are favored.
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What is gene flow?
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Movements of alleles from one population to another. Also called migration.
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What are gene frequencies?
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Allelic and genotypic frequencies in a population.
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Macroevolution
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Large scale changes in the history of life.
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Microevolution
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Heritable changes that occur within populations, over relatively short periods of time.
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Mutation
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Heritable changes in the DNA.
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Nonrandom Mating
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Mating that occur at frequencies greater or less than the proportional representation in a population.
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Random Mating
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Matings at a frequency that is proportional to each geneotypes representation in the population.
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Stabilizing selection
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A type of natural selection in which individuals at or near the mean value for a trait are favored.
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spontaneous generation
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Lamarck- believed that life arose from non-life, and organisms became more complex as they responded to changes to the environment
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uniformitarianism
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Lyell's bookPrinciples of Geology- concept states that natural geologic processes were uniform in frequency and magnitude over time. Could explain the formation of a canyon, from erosion.
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catastrophism
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A short lived cataclysmic event.
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