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17 Cards in this Set
- Front
- Back
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The combined alleles of all the individuals in a population |
Gene pool |
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a measure of how common a certain allele is in the population |
Allele frequency |
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The frequency is highest near the mean value and decreases toward each extreme end of the range |
Normal distribution |
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is the observable change in the allele frequencies of a population over time |
microevolution |
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a type of selection that favors phenotypes at one extreme of trait's range |
directional selection |
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the intermediate phenotype is favored and becomes more common in the population |
stabilizing selection |
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when both extreme phenotypes are favored |
disruptive selection |
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the movement of alleles from one population to another |
gene flow |
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changes in allele frequencies that are due to chance |
genetic drift |
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genetic drift that occurs after an event greatly reduces the size of a population |
bottleneck effect |
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is genetic drift that occurs after a small number of individuals colonize a new area |
founder effect |
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when certain traits increase mating success |
sexual selection |
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when members of different populations can no longer mate successfully with one another |
reproductive isolation |
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the rise of two or more species from one existing species |
speciation |
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isolation caused by differences in courtship or mating behaviors |
behavioral isolation |
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involves physical barriers that divide a population into two or more groups |
geographic isolation |
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when timing prevents reproduction between populations |
temporal isolation |
