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Meiotic division of the secondary oocyte is completed

1. At the time of copulation
2. After zygote formation
3. At the time of fusion of a sperm with an ovum
4. Prior to ovulation

Correct answer: At the time of fusion of a sperm with an ovum

Solution

The secondary oocyte is arrested in metaphase II and only completes the second meiotic division when a sperm fuses with it. This fertilization-triggered completion produces the mature ovum and allows formation of the zygote afterward.

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