The process of sperm formation is called spermatogenesis and occurs in seminiferous tubules of the testis. The germ cells or spermatogonia divide mitotically to form primary spermatocytes (2n) which through meiosis form secondary spermatocytes (n) which further undergo meiosis II to form spermatids (n). Spermatids transform into mature sperms or spermatozoa. Hence, primary spermatocytes which are diploid have the same number of chromosomes as any somatic cells i.e., 22 pairs of autosomes and XY chromosomes