Two species of squirrel (we will call them A and B) share a hybrid zone that is 6,000 km in length and only 20 km wide. The frequency of alleles specific to species A decreases from close to 100% at one edge of the hybrid zone down to 0% on the other end, while the alleles specific to species B decreased from close to 100% on the other side of the hybrid zone to 0% on the opposite edge. . Predict how this gene distribution will change over time if reinforcement occurs. Explain your answer.

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