Q16. Explain spermatogenesis with the help of a schematic representation.
Answer:
❖ Spermatogenesis is a process in which diploid spermatogonia undergo meiosis to produce haploid spermatids.
❖ Spermatogenesis begins at puberty.
❖ The spermatogonia (2n) present on the inside wall of seminiferous tubules multiply by mitotic division and increase in numbers.
❖ Each spermatogonium is diploid and contains 46 chromosomes.
❖ Resultant cells are called primary spermatocytes (2n).
❖ These primary spermatocytes periodically undergo meiosis and produce two equal, haploid cells called secondary spermatocytes (n), which have only 23 chromosomes each.
❖ The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids (n).
❖ The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis.
![vlcsnap-2021-07-19-18h08m15s115.png](https://static.wixstatic.com/media/bb7697_e6401c589b554f7e9283ec8b3246d50c~mv2.png/v1/fill/w_600,h_338,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/vlcsnap-2021-07-19-18h08m15s115.png)