BIOA02H3 Chapter 23: Chapter 23
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BIOA02H3 Full Course Notes
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Document Summary
Charles darwin said sexual selection was the cause for evolution conspicuous trait in species. Traits are exaggerated in species in which individuals of one sex (usually male) compete to mate with opposite sex. Exaggerated trait evolves in competition among males for access to female/ attracting discriminating females. Sexual selection can also increase rate of new species form. Comparison of the number of species found in sister clades (same ancestor) suggests development of new species from sexual selection. In promiscuous mating system, male bird evolved bright plumage and ornament (long tail feathers), female raises its child with no help from male. In monogamous species, members form pair bond and share responsibilities of raising the young. Individuals of both sexes have dull plumage and look alike. Sexual selection stimulates divergence of a lineage into many species. We can recognize and identify many species by their appearance. Classification of species on the basis of their appearance.
