The primary sporogenous cells (PSCs) result after the periclinal division of the archesporial cells. The PSCs may undergo mitotic divisions and increase in number before functioning as MMCs or the PSCs may function directly as MMCs. The MMCs undergo meiosis and give rise to haploid microspores. The details of meiosis have been extensively studied. Anthers are ideal systems to study meiosis. This is mainly due to the fact that, they are readily available and accessible for experimentation; and each anther contains a large number of meiocytes, mostly exhibiting synchrony. Most of the information on meiosis has been obtained from investigations on anthers.