sexual selection

n. Biology The process in nature by which individuals with certain traits, especially secondary sex characteristics such as colorful plumage and large antlers, are chosen more often for mating and thus pass those traits on to their offspring.

sexual selection

n (Zoology) an evolutionary process in animals, in which selection by females of males with certain characters, such as large antlers or bright plumage, results in the preservation of these characters in the species

sex′ual selec′tion

n. the Darwinian theory that the selection of mates is based on attractive features, as coloration or song in birds.

sexual selection

sexual selection:

see selectionselection.
In Darwinism, the mechanism of natural selection is considered of major importance in the process of evolution. Popular formulations sometimes envisage a struggle for existence in which direct competition for mates or for various factors in the environment (e.g.
..... Click the link for more information. .

Sexual Selection

the particular form of natural selection distinguished by the evolutionary development of secondary sex characteristics. These characteristics include the bright nuptial plumage of many birds, including ducks and grouse, the dances of insects, the mating calls of birds, the fighting of male birds and mammals, the varied sound signals of males used to attract females, and the odoriferous glands of insects and mammals used for attracting the opposite sex. Prominent characteristics, such as coloration, develop chiefly in males. Females, especially during the reproductive period, are usually protected by appropriate behavior, coloration, and form.

The primary basis for sexual selection was the divergence in the identifying characteristics of males and females, which probably facilitated inbreeding of the same species and prevented crossbreeding with other species. Subsequently, individuals with more pronounced sexual characteristics attracted the opposite sex more easily and had the advantage in reproduction.

The ethological or behavioral mechanisms of isolation are partially affected by sexual selection. The course of sexual selection sometimes conflicts with other trends of natural selection. Genotypes that are preserved make reproduction more successful but do not increase the viability of the species as a whole. However, this does not justify contrasting sexual selection with natural selection or considering it an independent factor in evolution. Sexual selection was first suggested by C. Darwin in 1859 and later substantiated in 1871.

REFERENCES

Darwin, C. Proiskhozhdenie vidov putem estestvennogo otbora. In Soch, vol. 3. Moscow-Leningrad, 1939. (Translated from English.)
Darwin, C. Proiskhozhdenie cheloveka i polovoi otbor. In Soch., vol. 5. Moscow, 1953. (Translated from English.)
Shmal’gauzen, I. I. Problemy darvinizma, 2nd ed. Leningrad, 1969.

A. V. IABLOKOV

sexual selection

[¦seksh·ə·wəl si′lek·shən] (evolution) A special form of natural selection responsible for the evolution of traits that promote success in competition for mates.

sexual selection

sex·u·al se·lec·tion

a form of natural selection in which, according to darwinian theory, the male or female is attracted by certain characteristics, form, color, behavior, etc., in the opposite sex; thus modifications of a special nature are brought about in the species.

sexual selection

sex·u·al se·lec·tion

(sek'shū-ăl sĕ-lek'shŭn) A form of natural selection in which, according to Darwin's theory, the male or female is attracted by certain characteristics, forms, colors, behaviors, and phenomena, in the opposite sex; thus, modifications of a special nature are brought about in the species.

sexual selection

the selection of a mate by female animals where, for example, the most brightly coloured is favoured, so maintaining brightly coloured males in a population. Some authorities consider that sexual selection explains the existence of SECONDARY SEXUAL CHARACTERS.

单词	sexual selection
释义	sexual selection sexual selection n. Biology The process in nature by which individuals with certain traits, especially secondary sex characteristics such as colorful plumage and large antlers, are chosen more often for mating and thus pass those traits on to their offspring. sexual selection n (Zoology) an evolutionary process in animals, in which selection by females of males with certain characters, such as large antlers or bright plumage, results in the preservation of these characters in the species sex′ual selec′tion n. the Darwinian theory that the selection of mates is based on attractive features, as coloration or song in birds. sexual selection sexual selection: see selectionselection. In Darwinism, the mechanism of natural selection is considered of major importance in the process of evolution. Popular formulations sometimes envisage a struggle for existence in which direct competition for mates or for various factors in the environment (e.g. ..... Click the link for more information. . Sexual Selection the particular form of natural selection distinguished by the evolutionary development of secondary sex characteristics. These characteristics include the bright nuptial plumage of many birds, including ducks and grouse, the dances of insects, the mating calls of birds, the fighting of male birds and mammals, the varied sound signals of males used to attract females, and the odoriferous glands of insects and mammals used for attracting the opposite sex. Prominent characteristics, such as coloration, develop chiefly in males. Females, especially during the reproductive period, are usually protected by appropriate behavior, coloration, and form. The primary basis for sexual selection was the divergence in the identifying characteristics of males and females, which probably facilitated inbreeding of the same species and prevented crossbreeding with other species. Subsequently, individuals with more pronounced sexual characteristics attracted the opposite sex more easily and had the advantage in reproduction. The ethological or behavioral mechanisms of isolation are partially affected by sexual selection. The course of sexual selection sometimes conflicts with other trends of natural selection. Genotypes that are preserved make reproduction more successful but do not increase the viability of the species as a whole. However, this does not justify contrasting sexual selection with natural selection or considering it an independent factor in evolution. Sexual selection was first suggested by C. Darwin in 1859 and later substantiated in 1871. REFERENCES Darwin, C. Proiskhozhdenie vidov putem estestvennogo otbora. In Soch, vol. 3. Moscow-Leningrad, 1939. (Translated from English.) Darwin, C. Proiskhozhdenie cheloveka i polovoi otbor. In Soch., vol. 5. Moscow, 1953. (Translated from English.) Shmal’gauzen, I. I. Problemy darvinizma, 2nd ed. Leningrad, 1969. A. V. IABLOKOV sexual selection [¦seksh·ə·wəl si′lek·shən] (evolution) A special form of natural selection responsible for the evolution of traits that promote success in competition for mates. sexual selection sex·u·al se·lec·tion a form of natural selection in which, according to darwinian theory, the male or female is attracted by certain characteristics, form, color, behavior, etc., in the opposite sex; thus modifications of a special nature are brought about in the species. sexual selection n. Biology The process in nature by which individuals with certain traits, especially secondary sex characteristics such as colorful plumage and large antlers, are chosen more often for mating and thus pass those traits on to their offspring. sex·u·al se·lec·tion (sek'shū-ăl sĕ-lek'shŭn) A form of natural selection in which, according to Darwin's theory, the male or female is attracted by certain characteristics, forms, colors, behaviors, and phenomena, in the opposite sex; thus, modifications of a special nature are brought about in the species. sexual selection the selection of a mate by female animals where, for example, the most brightly coloured is favoured, so maintaining brightly coloured males in a population. Some authorities consider that sexual selection explains the existence of SECONDARY SEXUAL CHARACTERS. ThesaurusSeeselection
随便看	apogamicly apogamous apogamously apogamy apogce apogeal apogean apogeanly apogean tidal currents apogean tides apogee apogee boost motor apogee burn maneuver apogee doctor on call apogee dwell apogee kick motor apogee kick planning apogee motor firing apogees apogeic apogeny apogeotropic apogeotropism apogeum apogi