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What is sexual selection in biology

  • 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.
  • 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. Sexual selection is a concept that has probably been misunderstood and misrepresented more than any other idea in evolutionary biology.
  • In evolution, the selection of a mate based on secondary sex characteristics.

Received standard naturalist Charles Darwin revolutionized scientific intelligent when he proposed that species evolve over time to become adapted to their environments not later than means of intuitive selection in his On the Extraction of Species He was initially puzzled, though, past the seemingly futile exaggerated characters ofttimes found in animals, particularly males.

The long and colorful tail of the peacock, for model, seemed to deter rather than support its bearer influenceable. In his following work, The Descent of Man, and Selection in About to Sex Depreciating, Darwin proposed that some characters do not increase survival, but instead expansion reproductive success. He called this lustful selection, which refers to the prepare that produces traits that affect an individual's reproductive happiness as a repercussion of competition concluded mates.

Intrasexual Selection


Sexual selection , theory in postulating that the evolution of certain conspicuous physical traits—such as pronounced coloration, increased size, or striking adornments—in animals may grant the possessors of these traits greater success in obtaining mates.

Mutual attraction between the sexes is an important factor in reproduction. The males and females of many animal species are similar in size and shape except for the sexual organs and secondary sexual characteristics such as the breasts of female mammals.

There are, however, species in which the sexes exhibit striking dimorphism or physical difference. Particularly in birds and mammals, the males are often larger and stronger, more brightly coloured, or endowed with conspicuous ornamentation. These traits, however, make animals more visible to predators—the long plumage of male peacocks Pavo cristatus and birds of paradise Paradisaea and the enormous antlers of aged male deer Odocoileus are cumbersome loads in the best of cases.

Darwin knew that natural selection could not be expected to favour the evolution of disadvantageous traits, and he was able to offer a solution to this problem. The concept of sexual selection as a special form of natural selection is easily explained.

Other things being equal, organisms more proficient in securing mates have higher fitness. There are two general circumstances leading to sexual selection. One is the preference shown by one sex often the females for individuals of the other sex that exhibit certain traits.

The other is increased strength usually among the males that yields greater success in securing mates.

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Natural Selection & Sexual Selection: An Illustrated Introduction

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Was it the alcohol talking? noun Biology. a special type of natural selection in which the sexes acquire distinct forms either because the members of one sex choose mates with particular. Environmental, physical, or biological factors often drive natural selection, whereas sexual rivals and mates are the exclusive agents of sexual selection..

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