Developmental biology part 7 spermatogenesis and oogenesis in mammals
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Spermatogenesis is the process by which sperm are produced from male primordial germ cells through mitosis and meiosis. The initial cells in this pathway are called spermatogonia, which produce primary spermatocytes through mitosis. The primary spermatocyte divides meiotically into two secondary spermatocytes; Each secondary spermatocyte then completes meiosis by dividing into two spermatids. These develop into mature sperm, also called spermatozoa. Thus, the primary spermatocyte gives rise to two cells, the secondary spermatocytes, and the two secondary spermatocytes through their subdivision produce four spermatozoa.[1]

Sperm are the mature male gametes of many sexually reproducing organisms. Thus, spermatogenesis is the male version of gametogenesis. In mammals, it occurs gradually in the male testes and epididymis. Spermatogenesis is highly dependent on optimal conditions for the process to occur correctly and is essential for sexual reproduction. DNA methylation and histone modification have been implicated in the regulation of this process.[2] It begins at puberty and usually continues uninterrupted until death, although a slight decrease in the amount of sperm produced may be seen with age (see Male infertility).
Oogenesis, oogenesis or oögenesis /ˌoʊ.əˈdʒɛnɨsɪs/[1] is the creation of an ovum (ovum). It is the female form of gametogenesis; the male equivalent is spermatogenesis. This involves the development of different stages of the immature egg cell.
In mammals, the first part of oogenesis begins in the germinal epithelium, which gives rise to the development of ovarian follicles, the functional unit of the ovary.

Note that this process, important for all animal life cycles but unlike all other cases of cell division, occurs completely without the help of spindle-coordinating centrosomes.[2][3]

Oogenesis includes several sub-processes: oocytogenesis, ootidogenesis and finally maturation to form an egg (oogenesis proper). Folliculogenesis is a distinct subprocess that accompanies and supports the three ovogenetic subprocesses. The source of the article published in description is Wikipedia. I share their material. Copyright of Wikipedia's original content developers.
Link – http://en.wikipedia.org/wiki/Main_Page

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