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18 Cards in this Set
- Front
- Back
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Species
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A group of organisms whose members successfully reproduce among themselves
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Evolution
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change in the heredity features of species over time
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Darwin
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Developed the theory of Natural selection
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Natural Selection
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organisms with traits best suited to their environment are more likely to survive and pass these traits to their offspring
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Variation
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an inherited trait that makes an individual different from members of the same species
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Adaptation
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any variation that makes an organism better suited to its environment
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Mutations
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changes in an organism's DNA
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Immigration
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organisms move into a population
(bring in new traits) |
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Emigration
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organisms move out a population
(remove traits from a population) |
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Isolation
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organisms separated into a new environment.
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What are some sources of variation?
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Mutations, immigration, emigration, isolation, climate change
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What is Climate Change?
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changes in temperature, precipitation, etc.
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What is Gradualism?
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model describing evolution as a slow change of one species to another new species.
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What is Punctuated Equilibrium?
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model describing rapid evolution of a species that come about by the mutation of just a few genes.
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1st principle of natural selection
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1. organisms produce more offspring than can survive
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2nd principle of natural selection
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2. variations are found among individuals of a species
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3rd principle of natural selection
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3. some variations enable members of a population to survive and reproduce
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4th principle of natural selection
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4. over time, offspring of individuals with helpful variations make up more and more of a population
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