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Gametophytegenes(ga)forsegregationdistortionhavebeenreportedbymanyresearchers.Iwataetal(1964)reportedthepresenceofagametophytegenega1onchromosome6whichcontrolledaselectivefertilizationofgametesinthecrossbetweenanatomic_bomb_irradiatedmutantandanormalvarie