The Question is from neet-botany cell-cycle-and-cell-division mitosis, and it was created by the author NISHANTH

Question

If cytokinesis fails during telophase in a plant cell, what would be the observed chromosome number in the resulting cell, and what structure would be missing?

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Cytokinesis in Plant Cells
 **Related Topics**: Cell cycle, mitosis, cell plate
 **Prerequisites**: Understanding of telophase, cytokinesis, and cell plate formation in plant cells.
## SOLUTION PATHWAY
**Given Information**:
  * Cytokinesis failure during telophase in a plant cell.
**Method & Steps**:
 1. Understand the role of cytokinesis: Cytokinesis is the process of cell division where the cytoplasm divides, creating two separate daughter cells. In plant cells, this involves the formation of a cell plate.
  Reasoning: If cytokinesis fails, the cell will not divide, leading to a single cell containing the genetic material of what would have been two daughter cells.
  Formula/Rule: None directly applicable.
 2. Determine the chromosome number: Since the cell doesn't divide, the chromosome number will be double the normal number.
  Working: The cell will contain all the chromosomes that would have been present in two daughter cells.
  Key Point: Plant cells use a cell plate to divide their cytoplasm, unlike animal cells which use a cleavage furrow.
 3. Identify the missing structure: Since cytokinesis failed, the cell plate, which is essential for plant cell division, will be absent.
  Result: Double the normal number; cell plate.
  Verification: The failure of cytokinesis directly leads to a doubled chromosome number and the absence of a cell plate in the resulting single cell.
 ## OPTION ANALYSIS
A :x: Half the normal number; cell wall - Incorrect.  The chromosome number would be doubled, not halved, and the cell wall is not directly related to cytokinesis in the same way as the cell plate.
B ✓: Double the normal number; cell plate - Correct. This accurately reflects the consequence of failed cytokinesis in a plant cell.
C :x: Normal number; nuclear membrane - Incorrect. The chromosome number would be doubled.  The nuclear membrane reforms during telophase, regardless of cytokinesis.
D :x: Triple the normal number; spindle fibers - Incorrect. The chromosome number would be doubled, not tripled, and spindle fibers disassemble during telophase.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the cell plate with the cell wall: The cell plate is a structure formed during cytokinesis that ultimately becomes part of the cell wall.
  2.Forgetting that plant and animal cells have different mechanisms for cytokinesis.
 **Quick Tips**:
  1.Remember that the cell plate is crucial for cytokinesis in plant cells.
  2.Failed cytokinesis results in a single cell with a doubled chromosome number.

NISHANTH · Answer

Half the normal number; cell wall

NISHANTH · Answer

The correct Option is "Double the normal number; cell plate"

NISHANTH · Answer

Normal number; nuclear membrane

NISHANTH · Answer

Triple the normal number; spindle fibers

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