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Question #45353
The Question
A continuous infusion of a synthetic estrogen analog with an extended half-life is administered to a healthy adult female. This maintains moderate serum levels that persistently saturate the negative feedback loop on the hypothalamic-pituitary axis. Which of the following accurately describes the consequence of this intervention on gametogenesis?
Options
- A.
The most advanced follicular oocyte remains a primary oocyte arrested in the diplotene stage of Prophase I, as the threshold for the LH surge is never reached.
- B.
The oocyte completes Meiosis I but remains arrested at Metaphase II within the Graafian follicle due to the absence of the FSH peak.
- C.
The primary oocyte transitions to a secondary oocyte but fails to extrude the first polar body due to sustained negative feedback on GnRH.
- D.
The resumption of Meiosis I is triggered, but ovulation is blocked because the prolonged half-life of the analog directly inhibits the rupture of the Graafian follicle.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
GnRH|LH|FSH|Negative_Feedback_Inhibition
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Understanding the biphasic feedback of estrogen (moderate levels = negative feedback; peak levels = positive feedback) and distinguishing the two meiotic arrest points in oogenesis.
Students often confuse the pre-ovulatory arrest state (Primary oocyte at Prophase I) with the pre-fertilization arrest state (Secondary oocyte at Metaphase II).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Human Reproduction - Class 12 |
| Concept | Meiotic Arrest Points |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |