Q16. Explain spermatogenesis with the help of a schematic representation.
❖ 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.