fertilization only occur when oocyte and sperm are activated .what happens when an activated sperm is able to penetrate ovum membrane .blocking the entrance of other sperms has a specific mechanism explained in this power point
Oocyte Activation
تخمک شدنفعال
1. Cortical reaction to block against
other sperm cells
2. Activation of egg metabolism
3. Reactivation of meiosis
4. DNA synthesis