The new and old rodents are both allopolyploid after undergoing sympatric speciation. a. two very similar rodent populations are found on two pacific islands near to one another. a scientist decides to mate some of the rodents and gets viable but sterile offspring. why? b. the offspring were rendered infertile by adaptive radiation, and their parents experienced vicariance. c. the rodents on one island are from recent ancestors that experienced sympatric speciation after allopolyploidy developed in their recent ancestors. d. the rodents on one island are from recent ancestors that experienced allopatric speciation after a dispersive separation from the rodents on the other island.