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.
This is the end of the preview. Sign up
access the rest of the document.
This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.