A small group of islanders leave "island A" and travel to "island B." After several generations on island B,a researcher finds that a large percentage of the population is left-handed.Left-handedness is a relatively rare trait on island A.A genetic event that explains this is

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The founder effect is when a small group of individuals from a larger population colonize a new area, leading to a loss of genetic diversity. In this case, the small group of islanders who traveled from Island A to Island B constitute a founder effect. If left-handedness was present in the small group that colonized Island B, then it would become more prevalent in their descendants due to the reduced gene pool.

A Small Group of Islanders Leave "Island A" and Travel