Gametogenesis notes
* The production of gametes is called gametogenesis.
* It occurs in the gonads.
* Gametes are of two types, namely spermatogenesis and egg.
* The production of spermatozoon is called spermatogenesis.
* It takes place in the testis.
* The production of egg (ovum) is called oogenesis.
* It occurs in the ovary.
Primordial germ cells :
* The cells which are destined to develop into gametes are called primordial germ cells.
* The gametes and the primordial germ cells constitute the germplasm.
* The germplasm is of paramount importance because the somatoplasm cease to exist with the death of animals.
* The germplasm continues to live on indefinitely in succeeding generations.
* The germplasm of an individual has come from it parents by way of the ovum and the sperm.
* The future of the human race depend on the germplasm held in trust within the bodies of the individuals now living.
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| Gametogenesis |
The gametogenesis :
* It is process of gamete formation in the sexually reproducing animals .
* The sexually reproducing animals contain two types of types cells in their body, e.g., Somatic cells and the germinal cells.
* Bothe types of cells have diploid number of chromosomes but each type has its different destiny.
* The somatic cells form various organs of the body.
* The somatic cells always multiply by mitotic division.
* The germinal cells form the gonads (testes and ovaries) in the animal body.
* These cells produce the gamete cells by successive mitotic and divisions.
* The process of sperm production is known as the spermatogenesis (Gr., sperma= sperm or seed; genesis= origin).
* The male gamete is known as spermatozoon or sperm and female gamete is known as ovum or egg.
* The process of production of ovum is known as oogenesis (Gr., oon = egg).
*Both the processes can be studied in details under separate heading.
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