A small number of minks float from the mainland to an island and establish a new population on the island. Migration is exceedingly rare so the populations evolve separately for a long period of time and become genetically differentiated. After a thousand years, a land bridge forms between the mainland and the island that allows minks to migrate to the island and breed with the island population. If a continual, large migration of minks to the island happens over many generations, how will the allele frequencies of the island population change?

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