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Answer: 3. Embryonic development stage

Key idea: Oogenesis begins before birth, during the embryonic stage.

Oogonia form in the foetal ovary, divide by mitosis, and enter meiosis I as primary oocytes. These get arrested at prophase I and stay arrested until puberty. So oogenesis is initiated in the embryonic development stage, although it is completed only after fertilisation.

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