If a tsunami strikes a small island and eliminates all but a small group of lizards, this would be an instance of genetic drift.
Genetic drift is the change in population frequency of a pre-existing gene variant brought on by random chance. Gene variants may completely vanish due to genetic drift, thereby reducing genetic variation. Additionally, it might lead to the much greater frequency and even fixation of previously rare alleles.
Genetic drift is the chance or random event-induced drifting of an allele's frequency in relation to the frequencies of the other alleles over time in a population. The so-called bottleneck effect is an illustration of how genetic drift magnifies its effects. Sewall Wright effect and allelic drift are synonyms.
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