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What is released at ovulation?
- a)Primary oocyte arrested at meiosis I
- b)Primary oocyte arrested at meiosis II
- c)Secondary oocyte arrested at meiosis I
- d)Secondary oocyte arrested at meiosis II
Correct answer is option 'D'. Can you explain this answer?
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What is released at ovulation?a)Primary oocyte arrested at meiosis Ib)...
Understanding Ovulation and Oocyte Development
During the menstrual cycle, ovulation is a crucial event that involves the release of a mature oocyte from the ovary. This process is tightly regulated by hormonal changes and is essential for reproduction.
The Oocyte at Ovulation
- At the time of ovulation, the oocyte that is released is not a primary oocyte, but rather a secondary oocyte.
- Specifically, the secondary oocyte is arrested at metaphase of meiosis II. This means that the oocyte has completed the first meiotic division but has not yet completed the second meiotic division.
Key Stages of Oocyte Development
- Primary Oocyte: Initially, oocytes start as primary oocytes, which are arrested in prophase I of meiosis. These oocytes remain in this state until puberty.
- Secondary Oocyte: Upon hormonal signaling during the menstrual cycle, a primary oocyte completes meiosis I, yielding a secondary oocyte and a polar body. The secondary oocyte then enters meiosis II but arrests at metaphase II until fertilization occurs.
Why Option D is Correct
- The correct answer is option D: "Secondary oocyte arrested at meiosis II" because this is the stage of oocyte that is released during ovulation.
- If fertilization occurs, the secondary oocyte will complete meiosis II, resulting in the formation of an ovum and another polar body.
Conclusion
Understanding the stages of oocyte development and the specific phase at which ovulation occurs is critical for grasping reproductive biology, particularly in the context of the NEET syllabus.
During the menstrual cycle, ovulation is a crucial event that involves the release of a mature oocyte from the ovary. This process is tightly regulated by hormonal changes and is essential for reproduction.
The Oocyte at Ovulation
- At the time of ovulation, the oocyte that is released is not a primary oocyte, but rather a secondary oocyte.
- Specifically, the secondary oocyte is arrested at metaphase of meiosis II. This means that the oocyte has completed the first meiotic division but has not yet completed the second meiotic division.
Key Stages of Oocyte Development
- Primary Oocyte: Initially, oocytes start as primary oocytes, which are arrested in prophase I of meiosis. These oocytes remain in this state until puberty.
- Secondary Oocyte: Upon hormonal signaling during the menstrual cycle, a primary oocyte completes meiosis I, yielding a secondary oocyte and a polar body. The secondary oocyte then enters meiosis II but arrests at metaphase II until fertilization occurs.
Why Option D is Correct
- The correct answer is option D: "Secondary oocyte arrested at meiosis II" because this is the stage of oocyte that is released during ovulation.
- If fertilization occurs, the secondary oocyte will complete meiosis II, resulting in the formation of an ovum and another polar body.
Conclusion
Understanding the stages of oocyte development and the specific phase at which ovulation occurs is critical for grasping reproductive biology, particularly in the context of the NEET syllabus.
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Community Answer
What is released at ovulation?a)Primary oocyte arrested at meiosis Ib)...
At ovulation, a secondary oocyte arrested at meiosis II is released from the ovary. This secondary oocyte will only complete meiosis II if it is fertilized by a sperm.
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What is released at ovulation?a)Primary oocyte arrested at meiosis Ib)Primary oocyte arrested at meiosis IIc)Secondary oocyte arrested at meiosis Id)Secondary oocyte arrested at meiosis IICorrect answer is option 'D'. Can you explain this answer?
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