The production of sperms from immature germ cells in males occurs by a process called spermatogenesis. The process occurs in testis (seminiferous tubule). In the process, a diploid spermatogonium (male germ cell) increases in size to form a diploid primary spermatocyte, which in its turn undergoes first meiotic division (reductional division ) to form two equal haploid secondary spermatocytes. Now each secondary spermatocytes undergoes second meiotic division to form two equal haploid spermatids, therefore, a diploid spermatogonium produces four haploid spermatids, these spermatids are transformed into spermatozoa (sperm). by the process of spermatogenesis.

Flow chart presentation of the process of spermatogenesis as below: