At what stage does dormancy occur in primary oocytes A Metap

At what stage does dormancy occur in primary oocytes? A. Metaphase I B. Prophase II C. Metaphase II D. Prophase I

Solution

Answer - Option D, Prophase I

Primary Oocytes remain dormant in prophase(diplotene) of Meosis I from month 5 of fetal life until puberty,(Option D)

After puberty primary oocytes begin maturation with each ovarian cycle, During the ovarian cycle, a primary oocyte completes Meosis I to form two daughter cells, the secondary oocyte and the first polar body which degenerates. The secondary oocyte promptly begins Meosis II but arrested in metaphase of Meiosis II(hence option B and C is incorrect as it is secondary oocyte not the primary oocyte that undergoes prophase II and metaphase II)