Topic: Fertilisation, embryo development to blastocyst, implantation· Reproduction

Meiotic division of the secondary oocyte is completed :

1. Prior to ovulation

2. At the time of copulation

3. After zygote formation

4. At the time of fusion of a sperm with an ovum

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

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Answer: 4. At the time of fusion of a sperm with an ovum

Key idea: The secondary oocyte is arrested in metaphase II and completes meiosis II only when a sperm penetrates.

Meiosis I finishes before ovulation, producing the secondary oocyte and first polar body. Sperm entry triggers meiosis II, giving the ovum and the second polar body, so it completes at the time of sperm-ovum fusion.

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

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Meiotic division of the secondary oocyte is completed :

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