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16 Cards in this Set
- Front
- Back
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Bell Curve
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a bell shaped graph that shows the standard distribution of a species.
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Biological Species Concept
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the principle that define a species as those organisms that can produce offspring together.
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Directional Selection
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a process that directs evolution towards an extreme trait when it is shown that an individual with this extreme trait is more fit to survive than one with an average form of the same trait.
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Disruptive Selection
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a type of natural selection in which individuals with two extreme forms of a trait have an advantage.
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Emigration
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the movement of individuals out of a population.
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Gene flow
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the movement of genes into or out of a population.
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Gene Pool
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all the genes from all of the traits in a population.
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Geographic Isolation
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the physical separation of populations.
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Immigration
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the movement of individuals into a population.
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Morphology
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the study of the internal and external structure and form of an organism.
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Population Genetics
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the study of evolution from a genetic point of view.
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Punctuated Equilibrium
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a theory that speciation occurs during brief periods of rapid genetic change.
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Reproductive Isolation
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the inability of formerly interbreeding organisms to produce offspring.
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Sexual Selection
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the preferential choice of a mate based on a specific phenotypic trait.
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Speciation
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the formation of a new species.
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Stabilizing Selection
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a type of natural selection in which the average form of a trait causes an organism to have an advantage in reproduction.
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