Sexual selection is a mode of natural selection where members of one biological sex choose mates of the other sex to mate with intersexual selection , and compete with members of the same sex for access to members of the opposite sex intrasexual selection. These two forms of selection mean that some individuals have better reproductive success than others within a population , either from being more attractive or preferring more attractive partners to produce offspring.
Cory Becher, Jennifer M Gumm; The roles of inter- and intra-sexual selection in behavioral isolation between native and invasive pupfishes, Current Zoology , Volume 64, Issue 1, 1 February , Pages —, https: Male—male competition and female mate choice may both play important roles in driving and maintaining reproductive isolation between species.
English naturalist Charles Darwin revolutionized scientific thinking when he proposed that species evolve over time to become adapted to their environments by means of natural selection in his On the Origin of Species He was initially puzzled, though, by the seemingly useless exaggerated characters often found in animals, particularly males.
Members of the competitive sex fight amongst themselves and the key event determines reproductive success whether it be fighting directly or fighting over control of a resource. Members of the competitive sex show off for mates and the opposite sex chooses the best display.
Sexual selection is a mode of selection that operates on an organism's ability to obtain a mate. Sexual selection allows some individuals to out compete others because they are better at securing mates.
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