Biology Evolution Unit
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13 Terms
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microevolution
a change in allele frequencies
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macroevolution
genetic changes lead to the development of a new species
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evolution
change in a species over time
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phenotypes
observable traits
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evidence of evolution
population shrinks in size due to chance events, non-random mating, genetic mutation, migration, natural selection
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genetic drift
small population
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gene flow
migrations
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natural selection
causes a trait to become more or less common in a population based on usefulness and if it aids the organisms in staying alive
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natural selection is present if
variability, heritability, and a reproductive advantage are present (all three MUST be present)
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Natural selection
causes a trait to become more or less common in a population based on usefulness and if it aids the organisms in staying alive.
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Evidence of evolution
population changes size due to chance events, non- random mating, genetic mutation, migration, natural selection.
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Microevolution
a change in allele frequencies.
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Macroevolution
genetic changes lead to the development of a new species.