Autoradiographic Studies on the Chronology of Meiosis and Spermiogenesis in the Cat

抄録

The duration of various stages of meiosis and spermiogenesis in the cat was estimated autoradiographically by using H³-thymidine. Leptotene and pachytene last for about 4, 00 and 15.50 days respectively. Zygotene is of shorter duration and is completed within 12 hours. The individual duration of stages from diplotene to metaphase-II is also extremely short and all these events succeed one another within 18 hours. Spermiogenesis lasts for at least 20.50 days. The total duration of meiosis and spermiogenesis never exceeds 41.25 days.