Spermiogenesis changes

The spermatogonia develop into primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division (reduction division), leading to the 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.