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Extrusion of second polar body from egg nucleus occurs 

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Extrusion of second polar body from egg nucleus occurs after entry of sperm but before fertilization.

The entry of sperm into the ovum induces completion of the meiotic division of the secondary oocyte.

Entry of sperm causes breakdown of metaphase promoting factor(MPF) and turns on anaphase promoting complex(APC).

So the correct answer is "After entry of sperm but before fertilization

Posted by

Satyajeet Kumar

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