0 a situation in which the frequency of a particular gene in a small population of living things changes without a known cause
1 a situation in which the number of a particular gene in a small population of living things changes without a known cause
Given enough time, genetic drift results in the fixation or loss of alleles at particular loci.
These data suggest that purifying selection removes deletion variation before it is fixed in populations, but that insertions are capable of fixing through genetic drift.
Molecular markers to study genetic drift and selection in wheat populations.
This is because genetic drift drives deleterious mutants to high frequencies for all mating systems.
Thus, each year the worms were subjected to selection pressure during 2 steps, and to genetic drift during 22 steps.
When populations are small, effects of genetic drift are more important.
The interaction between selection against partially recessive mutations and genetic drift in small populations also influences the rate of decay of neutral variation.
The biology of the crop would suggest that in its natural habitat, 'populations' could evolve by genetic drift into isolation, inlocalities such as river valleys.
