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Spermatogonia (2n) → 1° Spermatocyte (2n) → Meiosis I → 2° Spermatocyte (n) → Meiosis II → Spermatids (n) → Spermatozoa; Spermiogenesis: Transformation of spermatids into sperms; Spermiation: Release of sperms from Sertoli cells.