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Extrusion of the second polar body from the egg nucleus occurs:
- a)Simultaneously with the first cleavage
- b)After entry of sperm but before fertilization
- c)After fertilization
- d)Before entry of sperm into the ovum
Correct answer is option 'B'. Can you explain this answer?
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Extrusion of the second polar body from the egg nucleus occurs:a)Simul...
Understanding the Second Polar Body Extrusion
The process of extrusion of the second polar body is crucial in the context of oocyte maturation and fertilization. Here’s a detailed explanation of why the correct answer is option 'B'.
Timing of Polar Body Extrusion
- The second polar body is formed during the process of meiosis II, which occurs after the ovum completes meiosis I.
- This extrusion happens just before fertilization, as the oocyte is transitioning to become a fertilized egg.
Role of Sperm Entry
- Upon the entry of sperm into the ovum, it triggers various biochemical changes.
- These changes include the completion of meiosis II, leading to the extrusion of the second polar body.
Sequential Events in Fertilization
- The first polar body is expelled during meiosis I, which occurs before ovulation.
- The second polar body is extruded after the sperm penetrates the oocyte but before the two nuclei fuse to form the zygote.
Conclusion
- Thus, the second polar body is extruded after the entry of sperm but before the actual fertilization process (when the genetic material combines).
- This timing ensures that the oocyte is ready for successful fertilization, maintaining the correct chromosome number.
In summary, the correct answer is option 'B' because the extrusion of the second polar body occurs after sperm entry but before the fertilization event itself.
The process of extrusion of the second polar body is crucial in the context of oocyte maturation and fertilization. Here’s a detailed explanation of why the correct answer is option 'B'.
Timing of Polar Body Extrusion
- The second polar body is formed during the process of meiosis II, which occurs after the ovum completes meiosis I.
- This extrusion happens just before fertilization, as the oocyte is transitioning to become a fertilized egg.
Role of Sperm Entry
- Upon the entry of sperm into the ovum, it triggers various biochemical changes.
- These changes include the completion of meiosis II, leading to the extrusion of the second polar body.
Sequential Events in Fertilization
- The first polar body is expelled during meiosis I, which occurs before ovulation.
- The second polar body is extruded after the sperm penetrates the oocyte but before the two nuclei fuse to form the zygote.
Conclusion
- Thus, the second polar body is extruded after the entry of sperm but before the actual fertilization process (when the genetic material combines).
- This timing ensures that the oocyte is ready for successful fertilization, maintaining the correct chromosome number.
In summary, the correct answer is option 'B' because the extrusion of the second polar body occurs after sperm entry but before the fertilization event itself.
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Community Answer
Extrusion of the second polar body from the egg nucleus occurs:a)Simul...
The second polar body is extruded after the sperm enters the egg but before the completion of fertilization. The sperm entry triggers the completion of meiosis II, leading to the formation of the second polar body, which is then extruded from the egg nucleus.
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Extrusion of the second polar body from the egg nucleus occurs:a)Simultaneously with the first cleavageb)After entry of sperm but before fertilizationc)After fertilizationd)Before entry of sperm into the ovumCorrect answer is option 'B'. Can you explain this answer?
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