The geneticist Sewall Wright discovered that populations can change from one generation to the next just because they are small in size.

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Sewall Wright's theory of genetic drift states that random fluctuations in the gene pool of small populations can result in significant changes from one generation to the next. This can be caused by chance events such as deaths, births, and migrations, and is more likely to occur in smaller populations where random events have a greater impact.

The Geneticist Sewall Wright Discovered That Populations Can Change from One