The Question is from neet-botany sexual-reproduction-in-flowering-plants post-fertilization-structure-and-events, and it was created by the author D VINOD

Question

In human reproduction, the secondary oocyte completes meiosis II upon the entry of the sperm. What event marks this completion?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Meiosis II completion in the oocyte
 **Related Topics**: Fertilization, polar bodies, oogenesis
 **Prerequisites**: Understanding of meiosis and the stages of oogenesis
## SOLUTION PATHWAY
**Given Information**: The secondary oocyte completes meiosis II upon sperm entry.
**Method & Steps**:
1. Recall the events of meiosis II in the oocyte.
  Reasoning: Meiosis II results in the formation of a haploid ovum and a second polar body.
  Formula/Rule: N/A
2. Identify the event marking completion.
  Working: The extrusion of the second polar body signifies the completion of meiosis II.
  Key Point: The second polar body is a byproduct of the successful completion of meiosis II, ensuring the correct number of chromosomes in the resulting ovum.
3. Determine the correct answer.
  Result: The extrusion of the second polar body marks the completion of meiosis II.
  Verification: This is consistent with the biological process of oogenesis and fertilization.
 ## OPTION ANALYSIS
A :x: Formation of the first polar body: This occurs during meiosis I.
B ✓: Extrusion of the second polar body: This is the correct answer, as it directly indicates the successful completion of meiosis II.
C :x: Completion of meiosis I: This occurs before ovulation.
D :x: Ovulation: Ovulation is the release of the secondary oocyte, not the completion of meiosis II.
 ## LEARNING AIDS
 **Common Mistakes**: Confusing meiosis I and II events.
  1. [Error 1]:  Mistaking the first polar body extrusion for the marker of meiosis II completion: The first polar body is formed during meiosis I.
  2. [Error 2]:  Associating ovulation with meiosis II completion: Ovulation precedes the completion of meiosis II.
 **Quick Tips**: Remember that the second polar body's extrusion is the definitive sign of a successful completion of meiosis II in the oocyte.

D VINOD · Answer

Formation of the first polar body

D VINOD · Answer

The correct Option is "Extrusion of the second polar body"

D VINOD · Answer

Completion of meiosis I

D VINOD · Answer

Ovulation

NEET Botany Sexual Reproduction in Flowering Plants Post Fertilization Structure And Events MCQs

Select Topic

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

NEET Subjects

Our Bots

Company