Extrusion of second polar body from egg nucleus occurs (1) After entry of sperm and before completion of fertilization (2) After completion of fertilization (3) Before the entry of sperm (4) Without any relation with sperm entry

Answer: (1)

Once the sperm enters the ovum it allows the secondary oocyte to “meiotic split.” The sperm entry causes a breakdown of the metaphase promoting factor, and then the sperm enters fertilization. Second polar body extrusion is a result of oocyte activation which is affected by the fertilization process.

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