Dioecious species (the word deriving from the Greek for "two households") are species whose members can produce only one type of gamete; each individual organism belonging to a dioecious species's distinctly male or female. The majority of animal species (for example, all mammals and reptiles) are dioecious. In plants The term dioecious's typically used only of plants and plant species. In a dioecious species, no individual can produce both microspores and megaspores; individuals of the species… (More on Dioecious)