Maize is unique among plant species in having techniques available in which conversion from diploidy to tetraploidy can be accomplished by the use of two meiotic mutants that produce diploid unreduced gametes—namely, asynaptic (as) (e.g., Miller 1963, Alexander 1957) and elongate (el) (Rhoades and Dempsey 1966). Although theoretically these two mutants could be used to generate an extensive ploidy series, this has been accomplished only with the elongate mutant thus far.