House finches were found only in western North America until 1939, when a few individuals were released in New York City. These individuals established a breeding population and gradually expanded their range. The western population also expanded its range somewhat eastward, and the two populations have recently come in contact. If the two forms were unable to interbreed when their expanding ranges met, it would be an example of ________.

Question

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This scenario describes allopatric speciation, where geographic separation leads to the evolution of reproductive isolation between populations.

House Finches Were Found Only in Western North America Until