Oogenesis Oogenesis is the process by which female germ cells produce ova in the ovary . Although the process of gametogenesis in the female results in the production of a haploid gamete , there are numerous differences between the processes of spermatogenesis in the male and oogenesis in the female. The most obvious of these is that spermatogenesis occurs continuously (once started at puberty), while the process of oogenesis occur in a cyclic fashion and generally produces one mature egg per month. Another major difference is the timing of each of these processes. Spermatogenesis begins at puberty and continues throughout the life of the male; in contrast, oogenesis begins embryonically and only finishes after fertilization . In the fetal ovary, the germ cells differentiate into oogonia and mitotically multiply in number, resulting in 6 -7 million potential ova. The oogonia then arrest their development until shortly before birth. Just before birth, the oogonia develop into primary oocytes
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