6 What is spermatogenesis? Briefly describe the process of spermatogenesis.
Spermatogenesis- It is the process of formation of spermatozoa from spermatogonia in testes at the time of puberty is called spermatogenesis. In this process, the spermatogonia present at the inner side of seminiferous tubules multiply by mitotic division and increase in number. Each spermatogonium contains 46 chromosomes. Spermatogonia forms spermatocyte that undergoes meiotic division to produce secondary spermatocytes having 23 chromosomes. The secondary spermatocytes undergo 2nd meiotic division to form spermatids. The spermatids are transformed into spermatozoa by the process called spermiogenesis. The sperm heads remain embedded in the Sertoli cells and are released from seminiferous tubules by the process of spermiation