- Spermatogenesis is the process of the formation of haploid sperms from a diploid stem cell known as spermatogonium.
- The process occurs inside the seminiferous tubules in the testis.
- The entire process takes about 70 days.
- Spermatogenic germ cells are called spermatogonia.
- Spermatogonia are stem cells that are capable of self-renewing.
- They differentiate into intermediate spermatogonium, which is committed to differentiating into spermatozoa.
- Oogenesis is the process of formation of the ovum.
- The process occurs in the ovaries of the female.
- One oogonium produces a single ovum.
- Primary oocyte is the diploid cell, which is divided by meiosis, forming a single ovum.
- Oogenic germ cells are called oogonia, which are stem cells, self-renewing and differentiating into ova.
Difference Between Spermatogenesis and Spermiogenesis
|Definition||The production of sperms from spermatogonia is called spermatogenesis.||The production of eggs from oogonia is called oogenesis.|
|Oogenesis||Occurs in male||Occurs in female|
|Growth phase||Too short||Prolonged|
|Formation||Seminiferous tubules of testis||In ovaries|
|Process||Production of sperms from spermatogonia||Production of ovum from oogonia|
|Cell Division||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.|
|Continuity||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||Sertoli cells are found in the germinal cell epithelium, supporting the germinal cells.||No Sertoli cells are found in the germinal cell epithelium.|
|Food reserve||Sperm contains less food reserve||Ovum contain a lot of food reserve|
|Stages||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||Not involved|
|Location||Occurs entirely in testes||Occurs mostly in ovaries|
|Meiotic Division||Equal division of cells||Unequal division of cytoplasm|
|Primary Gametocyte||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 Gametocyte||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||4||1 (plus 2 -3 polar bodies)|
|Size of gametes||Sperm smaller than spermatocytes||Ova larger than oocytes|
|Duration||Uninterrupted process||In arrested process|
|Onset||beings at puberty||Begins in foetus (pre-natal)|
|Release||continuous||Monthly from puberty (menstrual cycle)|
|Initiation of process||Begins at puberty||Begins even before birth|
|Motility||Sperm are motile||Ovum is immotile|
|Starting cells||Start from a primary spermatocyte||Start from a primary oocyte|
|Result||Forms four motile male gametes i.e. sperms||Forms one non-motile female gamete i.e. ovum|
|Releasing||Sperms are released from the testis||Oocytes are released from the ovary which matures later|