||The production of sperms from spermatogonia is called spermatogenesis.
||The production of eggs from oogonia is called oogenesis.
||Occurs in male
||Occurs in female
||Seminiferous tubules of testis
||Production of sperms from spermatogonia
||Production of ovum from oogonia
||All spermatogonia are divided by meiosis, producing sperms all the times.
||Some of the oogonia divide during the production of eggs, one at a time.
||Spermatogenesis is a continuous process, occurring after the puberty till death.
||Early stages of the oogenesis occurs during the fetal period. The rest of the process occurs after the puberty. Only one ovum is produced per month until menopause.
|Production of ovum from oogonia
||Continuous, occurs after the puberty till death
||Discontinuous, occurs after the puberty until menopause
|| Sertoli cells are found in the germinal cell epithelium, supporting the germinal cells.
||No Sertoli cells are found in the germinal cell epithelium.
||Sperm contains less food reserve
||Ovum contain a lot of food reserve
||All stages occurs inside the testis
||Except the last stage which occurs in oviduct, all stages occurs inside the ovary
|germ line epithelium
||Involved in gamete production
||Occurs entirely in testes
|| Occurs mostly in ovaries
||Equal division of cells
||Unequal division of cytoplasm
||Primary spermatocyte is divided by meiosis 1, forming two secondary spermatocytes.
||Primary oocyte is divided by meiosis 1, forming a secondary oocyte and one polar body.
||Secondary spermatocyte is divided by meiosis 2, forming two spermatids.
||Secondary oocyte is divided by meiosis 2, forming ovum and one polar body.
|Number of gametes produced
|| 1 (plus 2 -3 polar bodies)
|Size of gametes
||Sperm smaller than spermatocytes
||Ova larger than oocytes
||In arrested process
||beings at puberty
||Begins in foetus (pre-natal)
||Monthly from puberty (menstrual cycle)
|Initiation of process
||Begins at puberty
|| Begins even before birth
||Sperm are motile
||Ovum is immotile
||Start from a primary spermatocyte
|| Start from a primary oocyte
||Forms four motile male gametes i.e. sperms
||Forms one non-motile female gamete i.e. ovum
||Sperms are released from the testis
||Oocytes are released from the ovary which matures later