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Extrusion of second polar body from egg nucleus occurs

1. after entry of sperm before completion of fertilization
2. after completion of fertilization
3. before entry of sperm
4. without any relation of sperm entry

Correct answer: after entry of sperm before completion of fertilization

Solution

In many animals, the secondary oocyte is arrested until sperm entry triggers completion of meiosis II. The second polar body is then extruded before fertilization is fully completed, so the egg nucleus can form the female pronucleus.

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