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19.2 Patterns and Processes of Evolution
Transcript of 19.2 Patterns and Processes of Evolution
Background Extinction - Extinction caused by slow and steady process of natural Selection
Mass Extinction - event during which many species become extinct during a relatively short period of time
Gradualism - the evolution of a species by gradual accumulation of small genetic changes over long periods of time
Punctuated Equilibrium - pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change.
Adaptive Radiation - process by which a single species or a small group of species evolves into several different forms that live in different ways.
Convergent Evolution - process by which unrelated organisms independently evolve similarities when adapting to similar environments.
Coevolution -process by which two species evolve in response to changes in each other over time. The study of life's history leaves no doubt that life has changed over time. Throughout the history of life, organisms have faced changing environments. When environmental conditions change, process of evolutionary change enable some species to adapt to new conditions and thrive. Over time scientists have discovered that the rate of evolution should be slow and steady All organisms change over time. Some organisms somewhat stay the same and this state is called equilibrium. A fast pace change still takes thousands of years. Most new species come from rapid change.