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-At what stage of meiosis is the oocyte lost due to menses? Prophase I or Metaphase II

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Answer: The oocyte lost due to menses is at Metaphase II (of meiosis) because at this stage the sister chromatids allign at the metaphase plate and the secondary oocyte then commences metaphase II which arrests and will not continue without fertilization. That means meiosis 2 i.e. Metaphase II is the stage where the oocyte lost due to menses as no fertilization occurs.

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