gametogenesis spermatogenesis and the structure of sperm oogenesis and structure of ovum. types of ova.
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Gametogenesis, the production of sperm and eggs, takes place through the process of meiosis. The production of sperm is called spermatogenesis and the production of eggs is called oogenesis.
The ovum itself has a central nucleus that contains the female's genetic material; this, with the genetic material in the sperm cell, determines the inherited characteristics of the child. Surrounding the nucleus is a cell plasma, or yolk, that contains nutritional elements essential to the developing egg cell
Egg envelope on the basis of origin are of three types. (2) Secondary egg envelops - These are secreted by ovary. e.g. - Chorion on insects. (3) Tertiary egg envelops - These are secreted by oviduct.
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