The Question is from neet-zoology human-reproduction gametogenesis, and it was created by the author A SUBRAMANYAM

Question

During human oogenesis, the first meiotic division is completed at which stage and results in the formation of what?

A SUBRAMANYAM · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Oogenesis and Meiosis
 **Related Topics**: Meiosis I, Meiosis II, Gametogenesis, Polar bodies
 **Prerequisites**: Understanding of meiosis stages and the process of oogenesis.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the completion of the first meiotic division during oogenesis and the resulting cells.
  [Important conditions]: Human oogenesis is the process of female gamete formation.
**Method & Steps**:
 1. Understand the stages of oogenesis and meiosis I.
  Reasoning: Oogenesis involves the production of a single haploid ovum from a diploid oogonium through meiosis.  Meiosis I reduces the chromosome number by half.
  Formula/Rule: N/A
 2. Identify the stage where the first meiotic division is completed.
  Working: The first meiotic division is completed during ovulation.  Before ovulation, the primary oocyte is arrested in prophase I.  At ovulation, meiosis I is completed, resulting in a secondary oocyte and a first polar body.
  Key Point: The secondary oocyte then proceeds to meiosis II, which is only completed if fertilization occurs.
 3. Determine the products of the first meiotic division.
  Result: The first meiotic division results in the formation of a secondary oocyte and a first polar body. 
  Verification: This aligns with the understanding of oogenesis and meiosis I.
 ## OPTION ANALYSIS
A :x: Incorrect. The first meiotic division is not completed at puberty; it begins before birth but is arrested in prophase I.
B ✓: Correct. The first meiotic division is completed at ovulation, producing a secondary oocyte and a first polar body.
C :x: Incorrect. The second meiotic division is completed at fertilization, resulting in an ovum and a second polar body.
D :x: Incorrect. Oogonia are diploid germ cells that undergo meiosis; they don't result from the first meiotic division.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing meiosis I and meiosis II completion times: Remember meiosis I is completed at ovulation, while meiosis II is completed after fertilization.
  2.Forgetting the role of polar bodies: Polar bodies are small cells that receive little cytoplasm and degenerate; they are a byproduct of oogenesis.
 **Quick Tips**:
  1.Visualize the process of oogenesis using diagrams to better understand the timing of meiotic divisions.
  2.Memorize the key stages and products of each meiotic division during oogenesis.

A SUBRAMANYAM · Answer

Puberty; primary oocyte and first polar body

A SUBRAMANYAM · Answer

The correct Option is "Ovulation; secondary oocyte and first polar body"

A SUBRAMANYAM · Answer

Fertilization; ovum and second polar body

A SUBRAMANYAM · Answer

Embryogenesis; oogonia and polar bodies

NEET Zoology Human Reproduction Gametogenesis MCQs

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