MediumZoology
+4 / -1
Polyspermy is normally prevented by
A
The fertilizin and antifertilizin reaction
B
Repulsion of excess number of sperm by ova
C
Inability of some sperm to penetrate ova
D
Formation of fertilization membrane
Explanation
After one sperm successfully enters the ovum, cortical granules release substances that modify the egg membrane, forming a fertilization membrane which prevents entry of additional sperms.
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