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15-3 NOTES: EVOLUTION IN ACTION PP. 308-311 EVOLUTION DEFINED… Evolution of a population is due to environment and the interaction of other species ARTIFICIAL SELECTION humans breed for specific traits causing differences in species (i.e. dog breeding) TYPES OF EVOLUTION Convergent evolution: Organisms with very different ancestors become more alike due to a common environment (i.e fish and whales)compare analogous structures Ex: whale and fish, bird and insect TYPES OF EVOLUTION Divergent evolution: populations become more and more dissimilar to adapt to the environment -compare homologous structures Adaptive Radiation: Population undergoes divergent evolution until it fills all areas of the environment • EX: Rough-skinned newt and garter snake • Newt evolved to produce neurotoxins then the snake evolved resistance to this toxin through genetic mutations. Birds and flowers, Humans and bacteria are other examples COEVOLUTION • When two species each evolve in response to each other over a long period of time. • This leads to a close relationship CLASSWORK “Types of Evolution Tree Map” Vocabulary 4-squares • • • • Convergent evolution Divergent evolution Artificial selection Coevolution Types of Evolution Convergent Evolution Divergent Evolution Definition Definition Example Example 4-SQUARE MODEL Definition Example Picture Word Related Words (3)