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hardMCQNEET 20192026Biology
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Extrusion of second polar body from egg nucleus occurs:

  1. A
    after entry of sperm but before fertilization
  2. B
    after fertilization
  3. C
    before entry of sperm into ovum
  4. D
    simultaneously with first cleavage

Solution & Step-by-step Explanation

[Image showing the stages of fertilization and polar body extrusion] The second meiotic division is only completed after the sperm has entered the secondary oocyte (ovum). This triggers the completion of meiosis II and the extrusion of the second polar body. Fertilization (fusion of nuclei) follows this step.

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Extrusion of second polar body from egg nucleus occurs:
A
after entry of sperm but before fertilization
B
after fertilization
C
before entry of sperm into ovum
D
simultaneously with first cleavage

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