Discussion
Which of the following statements for 'Genetic drift' is FALSE ?
Answer: B
The false statement is that genetic drift can lead to richness of genetic variation within populations.
Drift is random change in allele frequencies from one generation to the next because only a sample of gametes founds each generation. Its long-run effect is to lose alleles, as some drift to fixation and others to loss, so variation within a population falls.
The other three statements are true. Allele frequencies do change at random under drift. Because drift ignores fitness, a harmful allele can become fixed by chance. And the size of the random fluctuation scales inversely with population size, so drift is strongest in small populations, as in bottlenecks and founder events.
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