[Campbell Biology P.1078] At which stages of meiosis are oocytes typically arrested during hu... | Practice Question

At which stages of meiosis are oocytes typically arrested during human oogenesis?

  • A: Primary oocytes in prophase I, secondary oocytes in metaphase II.
  • B: Primary oocytes in metaphase I, secondary oocytes in anaphase II.
  • C: Both primary and secondary oocytes in prophase I.
  • D: Both primary and secondary oocytes in metaphase II.

Explanation

The text states that primary oocytes are 'arrested in prophase of meiosis I' before birth. It also says that the secondary meiotic division 'stops at metaphase' metaphase II , and thus the secondary oocyte is 'arrested in meiosis II'.