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21 Cards in this Set
- Front
- Back
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Five factors that lead to evolution
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-Genetic Drift
-Gene Flow -Mutation -Sexual Selection -Natural Selection |
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Reproductive isolation
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Members of different populations can no longer mate sucessfully
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Speciation
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when two or more species arise from one speices
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Behavioral Isolation
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the difference of courtship or mating behaviors
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Geographical Isolation
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physical barriers that divide a population into to or more groups
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Temporal Isolation
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when timing prevents reproduction between populations
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Mechanical Isolation
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when the reproductive parts don't fit together so they can't have any offspring
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Convergent Evolution
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evolution of unrelated species towards similar characteristics
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Divergent Evolution
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when closely related species evolve in different directions and become increasingly different.
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Gene pool
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the combined alleles of all of the individuals in a population.
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Allele Frequencies
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a measure of how common a certain allele is in a population.
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Mutation
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a random change of the DNA in a gene
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Recombination
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new allele combinations form in offspring.
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Normal Distribution
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the frequency is highest near the mean value and decreases toward each extreme end of the range
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Directional Distribution
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occurs when one extreme phenotype is favored by natural selection.
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Stabilizing Selection
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occurs when intermediate phenotypes are favored by natural selection
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Disruptive Selection
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occurs when both extreme phenotypes are favored by selection.
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Gene flow
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movement of alleles from one population to another
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Genetic Drift
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changes in allele frequencies that re due to chance.
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Hardy-Weinberg Equilibrium
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-Very large population
-No emigration or immigration -no mutations -no natural selection -random mating |
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Sexual selection
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females choose fancier males because they show desire things.
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