Question:
When does the extrusion of the second polar body from the egg nucleus occur?
When does the extrusion of the second polar body from the egg nucleus occur?
Show Hint
Key stages in human fertilization:
Primary oocyte → Meiosis I completed
Secondary oocyte → Arrested in Metaphase II
Sperm entry → Meiosis II completed → Second polar body released
Updated On: Apr 22, 2026
- Before entry of sperm
- During fertilization
- After entry of sperm but before fertilization
- After embryonic development begins
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Concept:
During oogenesis, the secondary oocyte is arrested in metaphase II.
Completion of meiosis II occurs only after the sperm enters the egg.
When the sperm penetrates the secondary oocyte:
• Meiosis II is completed.
• The second polar body is released.
• The mature ovum is formed.
Step 1: Understand the stage of the secondary oocyte. The secondary oocyte remains arrested at \[ \text{Metaphase II} \]
Step 2: Identify the trigger for meiosis completion. Entry of sperm triggers the completion of meiosis II.
Step 3: State when the second polar body is released. The second polar body is extruded \[ \boxed{\text{After entry of sperm but before fertilization}} \]
• Meiosis II is completed.
• The second polar body is released.
• The mature ovum is formed.
Step 1: Understand the stage of the secondary oocyte. The secondary oocyte remains arrested at \[ \text{Metaphase II} \]
Step 2: Identify the trigger for meiosis completion. Entry of sperm triggers the completion of meiosis II.
Step 3: State when the second polar body is released. The second polar body is extruded \[ \boxed{\text{After entry of sperm but before fertilization}} \]
Was this answer helpful?
0
0
Top MHT CET Biology Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- Important sperm lysin used for dissolving egg covering is
- In biogas plant, the role of acidogenic bacteria is to
- In $C_{3}$ plants, the first stable product of photosynthesis during the dark reaction is
- In case of anaerobic respiration, the RQ is ___________
View More Questions
Top MHT CET types of cells Questions
Top MHT CET Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- The temperature of $32^{\circ}C$ is equivalent to
- The line $5x + y - 1 = 0$ coincides with one of the lines given by $5x^2 + xy - kx - 2y + 2 = 0 $ then the value of k is
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
View More Questions