Which of the following statements for ‘Genetic drift’ is FALSE ?
Genetic drift can lead to richness of genetic variation within populations
Genetic drift is the change in allele frequencies from generation to generation caused by random sampling of gametes; it is not directed by fitness.
Because drift is random, alleles are lost or fixed by chance. Each loss or fixation removes variation, so the long-term effect of drift is a reduction of genetic variation (heterozygosity) within a population, not an enrichment of it.
The other statements are true: drift changes frequencies at random; it can fix even a mildly harmful allele by chance; and its effect is strongest in small populations, since sampling error is larger when the effective population size is small (bottleneck and founder effects).
Hence, Genetic drift can lead to richness of genetic variation within populations.
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