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9 Cards in this Set
- Front
- Back
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Evolution
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Change in the genes of a species over time; changes in allelic frequencies over time
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Conditions for Evolution
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Genetic Drift, genetic flow, mutation, non random mating, natural selection
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Equilibrium
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Allelic frequencies are constant; all conditions must be fulfilled or evolution will take place; difficult to maintain
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Conditions for equilibrium
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No genetic drift, no gene flow, no mutation, random mating, no natural selection
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Genetic Drift
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A change in allelic frequencies due to chance; disaster, disease; large populations keep more consistent allelic frequencies
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Founder Effect
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Alleles that are uncommon in the general population are common in a small, isolated population
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Bottleneck
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A population shrinks for a while then rebounds with less diversity; leaves only the alleles of the survivors in the new, growing population
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Gene Flow
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New genes entering the population (immigration); allows a new frequency of alleles; may introduce new alleles; difficult to prevent
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Nonrandom mating
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Random mating rarely occurs; mating practices are usually influenced
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