| Spermatogenesis | Oogenesis |
| Produces male gametes (sperm) | produces female gametes (oocytes) |
| Occurs in the seminiferous tubules (in testes) | Occurs in the ovaries |
| Occurs throughout life after puberty | Occurs after puberty until menopause |
| May produce 3,00,00,000 per day | Humans normally produce one oocyte during each ovarian cycle. |
| Primary spermatocyte divide equally to form two similar secondary spermatocytes. | Primary otocyte divide unequally to form one large secondary oocyte and a small polar body. |
| One spermatogonium produces 4 functional spermatozoa. | An oogonium produces one functional ovum and 3 non functional polar bodies. |
