selection

se·lec·tion

S0223600 (sĭ-lĕk′shən)n.1. The act of selecting something: looked at the pears and made a careful selection.2. One that is selected, such as a literary or musical text chosen for reading or performance: For her last selection she sang an old favorite.3. a. A carefully chosen or representative collection of people or things: a book containing a selection of the author's best work.b. A range of things from which one can make a choice: a store with a wide selection of magazines. See Synonyms at choice.4. Biology A natural or artificial process that involves the survival and reproduction of some kinds of organisms instead of others (because they have traits that are better adapted to the environment or that are preferred by a breeder, for example) and results in changes in the traits of a population or species.

se·lec′tion·al (-shə-nəl) adj.

selection

(sɪˈlɛkʃən) n1. the act or an instance of selecting or the state of being selected2. a thing or number of things that have been selected3. a range from which something may be selected: this shop has a good selection of clothes. 4. (Biology) biology the natural or artificial process by which certain organisms or characters are reproduced and perpetuated in the species in preference to others. See also natural selection5. (Horse Racing) a contestant in a race chosen as likely to win or come second or third6. a. the act of free-selectingb. a tract of land acquired by free-selection

se•lec•tion

(sɪˈlɛk ʃən)

n. 1. an act or instance of selecting or the state of being selected. 2. a thing or a number of things selected. 3. an aggregate of things displayed for choice, purchase, use, etc. 4. a process that results in some members of a population having greater success in perpetuating their genetic traits.

Selection

collection of things selected.

Thesaurus

Noun	1.	selection - the act of choosing or selecting; "your choice of colors was unfortunate"; "you can take your pick"choice, option, pickaction - something done (usually as opposed to something said); "there were stories of murders and other unnatural actions"casting - the choice of actors to play particular roles in a play or moviecoloration, colouration - choice and use of colors (as by an artist)sampling - (statistics) the selection of a suitable sample for studydecision, determination, conclusion - the act of making up your mind about something; "the burden of decision was his"; "he drew his conclusions quickly"willing, volition - the act of making a choice; "followed my father of my own volition"election - the act of selecting someone or something; the exercise of deliberate choice; "her election of medicine as a profession"balloting, vote, voting, ballot - a choice that is made by counting the number of people in favor of each alternative; "there were only 17 votes in favor of the motion"; "they allowed just one vote per person"
	2.	selection - an assortment of things from which a choice can be made; "the store carried a large selection of shoes"assortment, miscellanea, miscellany, mixed bag, motley, potpourri, salmagundi, smorgasbord, variety, mixture - a collection containing a variety of sorts of things; "a great assortment of cars was on display"; "he had a variety of disorders"; "a veritable smorgasbord of religions"
	3.	selection - the person or thing chosen or selected; "he was my pick for mayor"choice, pickdeciding, decision making - the cognitive process of reaching a decision; "a good executive must be good at decision making"pleasure - a formal expression; "he serves at the pleasure of the President"favorite, favourite - something regarded with special favor or liking; "that book is one of my favorites"way - doing as one pleases or chooses; "if I had my way"
	4.	selection - a natural process resulting in the evolution of organisms best adapted to the environmentnatural selection, survival of the fittest, survivalnatural action, natural process, action, activity - a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity"
	5.	selection - a passage selected from a larger work; "he presented excerpts from William James' philosophical writings"excerpt, excerption, extractpassage - a section of text; particularly a section of medium lengthchrestomathy - a selection of passages from different authors that is compiled as an aid in learning a languageanalecta, analects - a collection of excerpts from a literary workclipping, newspaper clipping, press clipping, press cutting, cutting - an excerpt cut from a newspaper or magazine; "he searched through piles of letters and clippings"track, cut - a distinct selection of music from a recording or a compact disc; "he played the first cut on the cd"; "the title track of the album"quotation, quote, citation - a passage or expression that is quoted or cited

selection

noun1. choice, choosing, pick, option, preference Make your selection from the list.2. anthology, collection, medley, choice, line-up, mixed bag (informal), potpourri, miscellany this selection of popular songs3. range, variety, assortment, series, collection, array, repertoire, gamut, lineup It offers the widest selection of antiques.

selection

nounThe act of choosing:choice, election, option, preference.

Translations

被挑选的过程选择选择物选集

select

(səˈlekt) verb to choose or pick from among a number. She selected a blue dress from the wardrobe; You have been selected to represent us on the committee.精选 adjective1. picked or chosen carefully. A select group of friends was invited.精选的2. intended only for carefully chosen (usually rich or upper-class) people. That school is very select. 有钱、有社会地位的人使用的，一流的 seˈlection (-ʃən) noun1. the act or process of selecting or being selected. a selection of boys for the choir; (also adjective) a selection committee. 选择，被挑选的过程 2. a collection or group of things that have been selected. a selection of verses/fruit.选集seˈlective (-tiv) adjective having the power of choice and using it, especially carefully. She is very selective about clothes. 精心选择的，有选择力的 selˈlectively adverb选择地seˈlectiveness noun选择性seˈlector noun a person who chooses, especially athletes, a team etc. The selectors have announced the cricket team to meet Australia. 选拔者，选择者

selection

→ 选择物zhCN

selection

selection.

In DarwinismDarwinism,
concept of evolution developed in the mid-19th cent. by Charles Robert Darwin. Darwin's meticulously documented observations led him to question the then current belief in special creation of each species.
..... Click the link for more information. , the mechanism of natural selection is considered of major importance in the process of evolutionevolution,
concept that embodies the belief that existing animals and plants developed by a process of gradual, continuous change from previously existing forms. This theory, also known as descent with modification, constitutes organic evolution.
..... Click the link for more information. . Popular formulations sometimes envisage a struggle for existence in which direct competition for mates or for various factors in the environment (e.g., food, water, and suitable space) counteracts the tendency toward overproduction of plants and animals resulting from the process of reproduction. But there are diverse ways other than direct struggle through which those organisms better adapted to the environment can survive and reproduce more successfully than those less fitted. A special form of natural selection, sexual selection, is also stressed in Darwinism. It attempts to account for secondary sexual characteristics that are not necessarily valuable in the struggle for existence. It assumes that the female selects as a mate one having the most highly developed of such characteristics, e.g., elaborate plumage or superior song, thereby perpetuating those characteristics. However, this interpretation is now questioned by many scientists. Artificial selection, the selection by humans of individuals best suited for their purposes, is common in plant and animal breeding.

Selection

in animal breeding, a form of artificial (methodical) selection; the choice of the most economically valuable animals for breeding. Along with the matching of parents that have been evaluated for the quality of their offspring and the proper rearing of the young, selection is an important means of creating and improving livestock breeds. In breeding work, individual selection based on comprehensive evaluation of animals, or boni-tation, according to their individual (phenotypic) and hereditary (genotypic) qualities, is most effective.

The basis of selection is genetic variation, which makes it possible to obtain desirable combinations of characteristics and to fix them in the offspring. The accumulation of beneficial qualities in the process of selection leads to improvement of breeds and the creation of new forms. In selection the body of the animal must be considered a single whole, and it is important to bear in mind C. Darwin’s principle of correlational variability in the development of separate parts of the body. In other words, selection for one characteristic often affects other related characteristics. Selection over a number of generations for one characteristic, for example, for external appearance or productivity, leads, as a rule, to the worsening of other features, to a general weakening of agricultural animals, or to various functional disorders.

The effectiveness of selection depends on the size of the animal population and its area of distribution (they must be sufficient), the fertility and early maturation of animals (rapidity of succession of generations), the nature of inheritance of characteristics, the variability of characteristics, the presence of correlative bonds between characteristics, and the intensiveness and direction of selection. (The higher the percentage of discarded animals in the herd, the better the part that remains, that is, the more rapidly does the herd improve.) A general index of the effectiveness of selection is the ratio of the index of the superiority of offspring of parents selected for breeding over the average population of the herd to the index of superiority of the parents over the same average.

E. IA. BORISENKO

Selection

in plant growing, the segregation of the best plants according to previously determined economic value and the segregation of the best seed material for subsequent reproduction. Selection is one of the principal methods of developing varieties of agricultural plants. The selection of plants and seeds usually takes into consideration such factors as potential yield and resistance to disease and pests. Two principal types of plant selection are used in the USSR: mass and individual.

In mass selection, a large number of homotypic plants that have a number of superior features are segregated. They are threshed together, and their seeds are sown in a single plot. This kind of selection is called single mass selection; if it is repeated over a number of generations, it is called repeated mass selection. Mass selection is simple and is widely used with cross-pollinating crops. This type of selection has some disadvantages. It is not possible to identify selected plants according to their offspring or to separate the most valuable forms from the population.

In individual selection, as in mass selection, superior plants are selected, but they are threshed separately. Their seeds are sown on separate plots. Thus, the parent plants can be identified according to their offspring. The offspring of inferior plants are discarded. The number of parent (elite) plants is usually from several hundred to 2,000 or 3,000. Individual selection may also be single or repeated. (See alsoARTIFICIAL SELECTION.)

REFERENCES

Obshchaia selektsiia i semenovodstvo polevykh kul’tur, 3rd ed. Moscow, 1958.
Pustovoit, V. S. Izbrannye trudy. Moscow, 1966.
Guliaev, G. V., and Iu. L. Guzhov. Selektsiia i semenovodstvo polevykh kul’tur. Moscow, 1972.

G. V. GULIAEV

selection

[si′lek·shən] (communications) The process of addressing a call to a specific station in a selective calling system. (genetics) Any natural or artificial process which favors the survival and propagation of individuals of a given phenotype in a population.

selection

Biology the natural or artificial process by which certain organisms or characters are reproduced and perpetuated in the species in preference to others

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Patient discussion about selection

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Synonyms for selection

noun choice

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noun anthology

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noun range

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Synonyms for selection

noun the act of choosing

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Synonyms for selection

noun the act of choosing or selecting

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noun an assortment of things from which a choice can be made

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noun the person or thing chosen or selected

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noun a natural process resulting in the evolution of organisms best adapted to the environment

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noun a passage selected from a larger work

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