Reinforcement is thought to be the agent of gametic isolation. Gametic phase is influenced by genetic linkage. Some of these daughter nuclei will continue to divide to create potential future gametic nuclei. Of these potential gametic nuclei, one will divide two more times. The Germ line is the gametic line where the gamete formation takes place. The other two daughter nuclei become the gametic micronuclei that will undergo autogamous self-fertilization.