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Name: Jerri Barnard Date: March 10, 2016 Text Comparison Matrix Concept/subject: Evolution Patterns Patterns Directional Selection Stabilizing Direction Disruptive Direction Divergent Evolution Convergent Evolution Description Favors one extreme form of a trait -results in species showing one extreme form of a trait (Ex: woodpeckers with long beaks) -favors the average form of a trait -results in less variation in a population (Ex: average sized spiders) -favors both extreme forms of a trait -can result in 2 new species over a long period of time (Ex: light and dark limpets) Species that were similar become different in order to adapt to different environments. (Adaptive radiation is a type of divergent evolution) Species that were unrelated evolve similar traits in order to occupy similar environments in different parts of the world. EX: pipe cactus and Euphorbia – both have fleshy body type and no leaves to survive the desert but totally unrelated Summary: There are three types of natural selection; directional, stabilizing, and disruptive. Directional favor one extreme trait, stabilizing favors the average trait, and disruptive favors both extreme forms of the trait. Divergent evolution is when species that were similar become different in order to adapt to different environments, while Convergent evolution takes species that were unrelated evolve similar traits to occupy similar environments in different parts of the world. Copyright © LEARNING-FOCUSED. All Rights Reserved. www.Toolbox.LearningFocused.com