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The Theory of Evolution
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Species A species consists of interbreeding populations of organisms that can produce healthy, fertile offspring.
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Most variation in a population results from mutation and recombination of existing alleles.
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Variation
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Some variations are adaptations that increase a population’s chances for survival and reproduction.
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Adaptation Example
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Physical and Behavioral Adaptations
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A niche is a particular role that an organism plays in a community
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Fossils are the preserved remains or imprints of ancient organisms
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Evolution
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Natural Selection There is variation within populations
Some variations are favorable Not all young produced in each generation can survive Individuals that survive and reproduce are those with favorable variations.
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Gradualism Theory that proposes new species evolve as the genomes of two populations differentiate over enormous spans of time. [Darwin]
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Gradualism
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Punctuated equilibrium
Theory that suggests that populations remain genetically stable for long periods of time, interrupted by brief periods of rapid genetic change. [Gould and Eldridge]
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Evidence for Evolution
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