Two species of lizard (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. These allele frequencies are depicted on the graph below. Predict how this gene distribution will change over time if fusion occurs. Explain your answer.

Question