The Isthmus of Panama cut off gene flow between Atlantic and Pacific populations of a species of fish.The cessation of gene flow led to the accumulation of genetic differences between the populations, which then led to reproductive isolation.Now, Atlantic and Pacific populations of this fish are separate species that cannot interbreed, even if they were again to come into contact with each other.The process described here is that of

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The process described in this scenario is that of allopatric speciation. Allopatric speciation occurs when a physical barrier (such as a geographic feature) separates a population, leading to the accumulation of genetic differences between the populations and eventually reproductive isolation. In this case, the Isthmus of Panama separates Atlantic and Pacific populations of the fish, leading to their speciation.

The Isthmus of Panama Cut Off Gene Flow Between Atlantic