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The second maturation division of the mammalian ovum occurs:

  1. A
    In the Graafian follicle following the first maturation division
  2. B
    Shortly after ovulation before the ovum makes entry into the Fallopian tube
  3. C
    Until after the ovum has been penetrated by a sperm
  4. D
    Until the nucleus of the sperm has fused with that of the ovum

Solution & Step-by-step Explanation

Oogenesis is arrested twice. The second meiotic (maturation) division is only completed after the sperm has penetrated the secondary oocyte (ovum) in the fallopian tube. This triggers the completion of meiosis and the release of the second polar body.

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The second maturation division of the mammalian ovum occurs:
A
In the Graafian follicle following the first maturation division
B
Shortly after ovulation before the ovum makes entry into the Fallopian tube
C
Until after the ovum has been penetrated by a sperm
D
Until the nucleus of the sperm has fused with that of the ovum

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Human ReproductionGametogenesisOogenesis

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