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The second maturation division of the mammalian ovum occurs:

1. shortly after ovulation before the ovum makes entry into the fallopian tube
2. until after the ovum has been penetrated by a sperm
3. until the nucleus of the sperm has fused with that of the ovum
4. in the graafian follicle following the first maturation division

Correct answer: until after the ovum has been penetrated by a sperm

Solution

In mammals, the secondary oocyte is arrested in metaphase II and does not complete the second maturation division until a sperm penetrates it. Sperm entry triggers completion of meiosis II, not mere ovulation or fusion of nuclei.

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