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Concept 53 - Concept 51.4 Behavioral traits can evolve by...

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Concept 51.4 Behavioral traits can evolve by natural selection Because of the influence of genes on behavior, natural selection can result in the evolution  of behavioral traits in populations. Behavior varies in natural populations. Behavioral differences between closely related species are common. Males of different Drosophila species sing different courtship songs. Species of voles differ in paternal care. Although less obvious, significant differences in behavior can be found within animal  species. When behavioral variation within a species corresponds to variation in environmental  conditions, it may be evidence of past evolution. One of the best-known examples of genetically based variation in behavior within a species  is prey selection by the garter snake Thamnophis elegans. Coastal garter snakes feed on salamanders, frogs, and toads, but mainly on slugs.
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