The Question is from neet-zoology chemical-coordincation-and-integration , and it was created by the author A SUBRAMANYAM

Question

During oogenesis, the first meiotic division is completed at which specific stage?

A SUBRAMANYAM · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Oogenesis and Meiosis
 **Related Topics**: Gametogenesis, Meiosis I and II, Ovulation
 **Prerequisites**: Understanding of the process of meiosis and the stages of oogenesis.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the completion of the first meiotic division during oogenesis.
  Options provided are different stages of oogenesis.
**Method & Steps**:
 1. Understand the stages of oogenesis and meiosis.
  Reasoning: Oogenesis involves the production of female gametes (ova).  Meiosis is a type of cell division that reduces the chromosome number by half.  The first meiotic division separates homologous chromosomes.
 2. Identify the stage when the first meiotic division is completed.
  Working: Oogenesis begins during fetal development, but the first meiotic division is arrested in prophase I until puberty.  At puberty, some primary oocytes resume meiosis I, and it's completed just before ovulation. The second meiotic division is completed only after fertilization.
 3. Select the correct option.
  Result: The first meiotic division is completed just prior to ovulation.
  Verification: This aligns with the understanding of oogenesis and the timing of meiosis I completion.
 ## OPTION ANALYSIS
A :x: During fetal development: Meiosis I begins in fetal development but is arrested in prophase I.
B :x: At puberty: At puberty, meiosis I resumes, but it's not completed at this stage.
C ✓: Just prior to ovulation:  The first meiotic division is completed just before ovulation, resulting in a secondary oocyte and a first polar body.
D :x: After fertilization: The second meiotic division is completed after fertilization.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing meiosis I and meiosis II completion times: Remember that meiosis I is completed before ovulation, while meiosis II is completed after fertilization.
  2.Incorrectly associating the start of oogenesis with its completion: Oogenesis begins during fetal development, but the process is not completed until after fertilization.
 **Quick Tips**:
  1.Remember the key phases: Prophase I (begins in fetal development), Metaphase I, Anaphase I, Telophase I (completed just before ovulation).
  2.Visual aids: Using diagrams of oogenesis and meiosis can be helpful in understanding the timing of these events.

A SUBRAMANYAM · Answer

During fetal development

A SUBRAMANYAM · Answer

At puberty

A SUBRAMANYAM · Answer

The correct Option is "Just prior to ovulation"

A SUBRAMANYAM · Answer

After fertilization

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