Topic: Gametogenesis: spermatogenesis and oogenesis· Reproduction

Extrusion of second polar body from egg nucleus occurs :

1. after entry of sperm but before fertilization

2. after fertilization

3. before entry of sperm into ovum

4. simultaneously with first cleavage

Doubtly Asked 30 Oct 2026 NEET UG 2019 Practice test neet Save WhatsApp Report

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Answer: 1. after entry of sperm but before fertilization

Key idea: Sperm entry stimulates completion of meiosis II.

The secondary oocyte is arrested at metaphase II. When the sperm enters, meiosis II is completed and the second polar body is extruded, but this is before the sperm and egg nuclei fuse (fertilisation proper). So it occurs after entry of the sperm but before fertilisation.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Extrusion of second polar body from egg nucleus occurs :

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