[Is selection an alternative or complementary to variation].
This paper reviews the data demonstrating a large magnitude of variability during long-term selection. The attention has been focused on the studies revealing preservation of genetic variability under conditions of intensive selection force. The data are discussed in terms of both classical genetic mechanisms to preserve variability and possible influence of selection on frequency of de novo arising changes. It is supposed that the selection vector and the rate at which the changes occur are interrelated. If selection acts mainly on phenotypes controlled by polygenes with regulatory functions, then its effect on variability is the highest. It is underlined that behavioral and physiological traits represent the phenotypes of such type.
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D000818:Animals; D005809:Genes, Regulator; D014644:Genetic Variation; D005822:Genetic Vectors; D010641:Phenotype; D012641:Selection, Genetic
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