Genetic drift is the spread of specific random variations throughout the gene pool in the absence of specific selection pressures. There's always random variation in the population, but there aren't always changes in the environment for the population to adapt to. So natural selection, in stead of moving the population towards adaptation, might select from that random variation to move 'sideways', as it were, to a state that's equally well-adapted to the environment as what came before, but different. As random variation may produce many variants that are, more or less, equally well-adapted to their environment, the direction of evolution that results is more or less random. Because variations may spread throughout small populations faster than throughout large populations, and because a large gene pool has a stabilizing effect on the spread of variations, small populations drift faster than large populations.
genetic drift may occur when a small group of individuals colonizes a new habitat
Are small
small populations
The population needs to be small is the necessary condition for genetic drift to have a significant effect on populations.
Random changes.This would be called genetic drift.
genetic drift may occur when a small group of individuals colonizes a new habitat
Genetic drift has a larger effect on smaller populations.
Are small
small populations
Small populations
Genetic drift is a product of random sampling. Like all forms of sampling or selection, variation within the sample set is required. Thus for genetic drift to occur genetic change (mutation) is required. However, it would be an error to call genetic drift a product of genetic change.
Small populations.
Genetic drift
genetic drift, mutation, natural selection, and migration
Genetic drift may occur when a small group of individuals colonizes a new habitat. These individuals may carry alleles in different relative frequencies than did the larger population from which they came.
false... its likely to occur in small population
natural selection or genetic drift