"Spermatogenesis is the process by which male spermatogonia develop into mature spermatozoa, also known as a sperm cell."
The cycle of the spermatogenesis takes 64 days and can be broken down into two successive sections:
Spermatocytogenesis: primitive cells called spermatogonia increase in number by mitosis.
Spermiogenesis: spermatids change in form during spermiogenesis. They change into the streamline spermatozoa adapted for fertilization.
Oogenesis is the process by which the ovum is developed. "Oogenesis consists of several sub-processes: oocytogenesis, ootidogenesis and finally maturation to form an ovum. Folliculogenesis is a separate sub-process that accompanies and supports all three oogenetic sub-processes."
Oocytogenesis: starts with the process of developing oogonia. This stage is complete either before or shortly after birth.
Ootidogenesis: when the primary oocyte develops into an ootid. This is achieved through the process of meiosis. The ootid eventually matures into an ovum.