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MCAT Biology Question — Oogenesis

Between fertilization and birth, a female germ cell begins oogenesis to produce a primary oocyte. Which of the following stages is the primary oocyte arrested in until puberty?

  1. Prophase I
  2. Anaphase I
  3. Prophase II
  4. Anaphase II




This question is testing the examinee’s knowledge of mitotic divisions and stages of meiosis corresponding to the female germ line in humans. Between fertilization and birth, female germ cells (oogonium) undergo replication to produce replicated primary oocytes. The primary oocytes are arrested in Prophase I until the female begins puberty, making A the correct answer.


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