They don't really seem to be sterile, rather just highly unlikely to get offspring: http://en.wikipedia.org/wiki/Panama_disease#Banana_breeding_impeded_by_tripl

They don't really seem to be sterile, rather just highly unlikely to get offspring: http://en.wikipedia.org/wiki/Panama_disease#Banana_breeding_impeded_by_triploidy http://en.wikipedia.org/wiki/Panama_disease#Banana_breeding_... It seems that with each meiosis step the banana plants become less fertile.