Evolution Vocabulary
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Evolution | Biological change over time that causes descendants to be different from their ancestors
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| Natural Selection | Organisms with traits that make them better adapted to their environment will live longer and reproduce more than organisms less adapted to the environment.
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| Gene pool | All the genes available in a population.
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| Gene flow example | Migration
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| Sexual selection | When traits that favor reproduction, even though they may decrease an organism's ability to survive, become more common over time.
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| Genetic equilibrium | When allelic frequencies re stable and unchanging, therefore evolution is not occurring.
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| Adaptation | A physical trait that increases an organism's ability to survive in its environment
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| Coevolution | When two organisms, such as predator and prey, evolve in response to one another.
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| Gradualism | Slow change in allele frequencies over long periods of time.
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| Convergent evolution | Evolution that results in the formation of analogous structures.
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| Divergent evolution | Evolution that results in the formation of homologous structures.
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| Mass extinction | Sudden elimination of a species due to a catastrophic event
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| Gradual extinction | Slow elimination of species caused by small environmental changes over extended periods of time
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| Speciation | When isolation, such as geography, causes two populations of organisms to become so different that they can no longer reproduce with each other and create viable offspring.
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| Viable offspring | organisms (resulting from sexual reproduction) capable of surviving successfully in particular environments
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| Species | population with unique traits adapted to their specific environment and able to interbreed
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| Analogous Structures | similar body structures, such as fins (whales, clownfish, sharks), due to organisms living in the same environment (the ocean), not the same ancestry
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| Homologous Structures | body structures similar in orientation, but completely different in function due to organisms living in different environments (limbs of cats, humans, horses, etc.)
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| Vestigial Structures | Examples: ostrich wings, whale leg bones
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| Fossils | Remnants of organisms such as imprints, bones, feces, etc.
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Created by:
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