Egg membranes. There are 3 types of egg membranes: Primary egg membrane:Formed by the egg itself inside the ovary ; eg. Zona pellucida in mammals and chorion in insects. Secondary egg membrane: Formed by the ovarian tissue before the egg leave the ovary.
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There are 3 types of egg membranes:
Fertilization occurs either external in aquatic animals or internal terrestrial animals .
Steps of fertilization:
2. Egg transport.
3. Sperm transport.
4. Penetration of the egg.
5. Fusion between egg & sperm.
6. Prevention of polyspermy.
7. Decondensation of egg and sperm nucleus.
8. Metabolic activation of the egg.