genetik sürüklenme

Турецкий язык - Английский Язык

Определение genetik sürüklenme в Турецкий язык Английский Язык словарь

(Pisikoloji, Ruhbilim) genetic drift

An overall shift of allele distribution in an isolated population, due to random fluctuations in the frequencies of individual alleles of the genes

Genes are inherently digital, in that an individual has an integer number of copies of each gene, and its children inherit an integer number of them That is, an individual cannot have half a gene While fitness may play a part in how many children inherit how many copies of a gene, in each individual child there is a large element of chance Genetic drift is where random (i e not related to fitness) fluctuations in the genetic material in the population occur and lead to macroscopic changes to the population Naturally genetic drift is more important in smaller rather than larger populations

Variation in allele frequencies between generations Drift tends to be more pronounced where high inbreeding occurs and population size is relatively small

Random fluctuations in gene frequencies, most evident in small populations

Refers to the constant tendency of genes to evolve even in the absence of selective forces Genetic drift is fueled by spontaneous neutral mutations that disappear or become fixed in a population at random Inbred lines separated from a common ancestral pair can drift rapidly apart from each other

Genetic change based on random changes within a species’ gene pool; includes fission and the founder effect, and gamete sampling

Random changes in gene frequency within a population resulting from sampling effects rather than natural selection, and hence of greatest importance in small populations

Random fluctuations in the frequency of the appearance of a gene in a small isolated population, presumably owing to chance rather than natural selection. 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

A change of gene frequencies within a population over time

change in gene frequencies in a small populations a result of each generation being unrepresentative of its parents

describes an accidental change in genetic structure which may result in a loss of alleles and thus in genetic variation The rarer an allele, the more likely its disappearance by genetic drift

Allele frequency changes in populations caused by random events rather than by natural selection, especially the effects of sampling error on the gene pool of small populations

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