Which among the following is the correct sequence of stages in spermatogenesis ?

Spermatid - spermatocyte -spermatogonia - sperm . Spermatogonia - spermatocyte -spermatid -sperm . Spermatocyte -spermatogonia - spermatid - sperm . Spermatogonia - spermatid - spermatocyte - sperm .

Spermatogonia - spermatocyte -spermatid -sperm .

The spermatogonia multiply by mitotic division and increase in numbers. Each spermatogonium is diploid and contains 46 chromosomes. Some of the spermatogonia called primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which have only 23 chromosomes each. The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids . The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis. After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation.