<P> In population genetics , fixation is the change in a gene pool from a situation where there exists at least two variants of a particular gene ( allele ) in a given population to a situation where only one of the alleles remains . In the absence of mutation or heterozygote advantage , any allele must eventually be lost completely from the population or fixed ( permanently established at 100 % frequency in the population ) . Whether a gene will ultimately be lost or fixed is dependent on selection coefficients and chance fluctuations in allelic proportions . Fixation can refer to a gene in general or particular nucleotide position in the DNA chain ( locus ) . </P>
<P> In population genetics , fixation is the change in a gene pool from a situation where there exists at least two variants of a particular gene ( allele ) in a given population to a situation where only one of the alleles remains . In the absence of mutation or heterozygote advantage , any allele must eventually be lost completely from the population or fixed ( permanently established at 100 % frequency in the population ) . Whether a gene will ultimately be lost or fixed is dependent on selection coefficients and chance fluctuations in allelic proportions . Fixation can refer to a gene in general or particular nucleotide position in the DNA chain ( locus ) . </P>
what is the complete loss of an allele called
what is the complete loss of an allele called
fixation
fixation