Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia.
Related to artificial selection: Directional selection
interference by humans with natural selection by purposeful breeding of animals or plants of specific genotype or phenotype to produce a strain with desired characteristics; for example, breeding of dairy cattle for high milk production.
Human intervention in animal or plant reproduction or survival to allow only individuals with desirable traits to reproduce.
ar·ti·fi·cial se·lec·tion(ahr'ti-fish'ăl sĕ-lek'shŭn)
Interference with natural selection by purposeful breeding of animals or plants of specific genotype or phenotype to produce a strain with desired characteristics.
artificial selectiona SELECTION process in which man chooses particular organisms from which to breed, based upon their PHENOTYPE, so aiming to alter the average GENOTYPE and phenotype of the resulting progeny (a form of DIRECTIONAL SELECTION). This process is carried out by plant and animal breeders whose job is to enhance certain features of the organisms with which they work, e.g. greater resistance to root rot in tomatoes, or higher milk yield in cattle. Such selection depends upon the presence of GENETIC VARIABILITY in the chosen population. See also HERITABILITY.
1. choosing the individual units to be included in a sample. See also random selection.
2. choosing the animals to be retained for breeding purposes; genetic selection.
selection based on human decisions.
proportionate reduction in the average genetic contribution made by a specific genotype, relative to the contribution made by another genotype. Denoted by s.
the animal characteristic which is used in a selection program.
a measure of the gain achieved by selection; the phenotypic superiority of selected individuals, compared to the population from which they were selected.
a single overall estimate of the patient's true breeding value obtained from as many sources of information as are available.
selection on the results of performance testing of the subject.
the superiority of the individuals selected for breeding, relative to the population from which they were selected.
the situation in which the entire population is homozygous for the same set of favorable genes; called also selection plateau.
when the rate of removal of a gene from the population by selection equals the rate at which mutations occur.
see selection limit.
the method used to select individuals from a population to be used for breeding. Usually includes nomination of the characters to be selected, the optimum size of the population in which the program is to operate, the intensity of selection available, the accuracy of the selection procedures, lengths of the generations in the species, the target rate of response.