Download Text Comparison Matrix Concept/subject: Evolution Patterns

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.
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