genetic drift


genetic drift
random changes in the frequency of alleles in a gene pool, usually of small populations. Cf. gene flow.
[1955-60]

* * *

Change in the pool of genes of a small population that takes place strictly by chance.

Genetic drift can result in genetic traits being lost from a population or becoming widespread in a population without respect to the survival or reproductive value of the gene pairs (alleles) involved. A random statistical effect, genetic drift can occur only in small, isolated populations in which the gene pool is small enough that chance events can change its makeup substantially. In larger populations, any specific allele is carried by so many individuals that it is almost certain to be transmitted by some of them unless it is biologically unfavourable.

* * *

also called  genetic sampling error  or  Sewall Wright effect,  

      a change in the gene pool of a small population that takes place strictly by chance. Genetic drift can result in genetic traits being lost from a population or becoming widespread in a population without respect to the survival or reproductive value of the alleles involved. A random statistical effect, genetic drift can occur only in small, isolated populations in which the gene pool is small enough that chance events can change its makeup substantially. In larger populations, any specific allele is carried by so many individuals that it is almost certain to be transmitted by some of them unless it is biologically unfavourable.

* * *


Universalium. 2010.

Look at other dictionaries:

  • genetic drift — n random changes in gene frequency esp. in small populations when leading to preservation or extinction of particular genes * * * the tendency for variations to occur in the genetic composition of small isolated inbreeding populations by chance.… …   Medical dictionary

  • genetic drift — n. in evolution, a) a random change in gene frequency within a small population, resulting in mutations which, regardless of their adaptive value, become fixed within the group b) any such process …   English World dictionary

  • Genetic drift — ] Especially in small populations, the statistical effect of sampling error ( during reproduction ) on certain alleles from the overall population may result in an allele ( and the biological traits that it confers ) becoming more common or rare… …   Wikipedia

  • genetic drift — Change in allele frequency from one generation to another within a population, due to the sampling of finite numbers of genes that is inevitable in all finite sized populations. The smaller the population, the greater is the genetic drift, with… …   Glossary of Biotechnology

  • genetic drift — genų dreifas statusas T sritis ekologija ir aplinkotyra apibrėžtis Atsitiktinis nekryptingas genų dažnio pakitimas populiacijoje. Nauji stabilūs genų deriniai gali lemti naujų sistematinių vienetų (ekotipų, mikrogeografinių rasių, porūšių)… …   Ekologijos terminų aiškinamasis žodynas

  • genetic drift — genų dreifas statusas T sritis augalininkystė apibrėžtis Atsitiktinis populiacijos genetinės sandaros pakitimas. atitikmenys: angl. genetic drift rus. генетический дрейф; дрейф генов …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • genetic drift — Genetic changes in isolated populations caused by random phenomena rather than by natural selection; see population, local …   Dictionary of invertebrate zoology

  • genetic drift — the tendency for variations to occur in the genetic composition of small isolated inbreeding populations by chance. Such populations become genetically rather different from the original population from which they were derived …   The new mediacal dictionary

  • genetic drift — genet′ic drift′ n. gen random changes in the frequency of alleles in a gene pool, usu. of small populations Compare gene flow • Etymology: 1955–60 …   From formal English to slang

  • genetic drift — /dʒəˌnɛtɪk ˈdrɪft/ (say juh.netik drift) noun a significant change in gene frequency in a population, occurring not as a result of selection, emigration or immigration, but from random causes affecting the alleles concerned …   Australian English dictionary


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.