The Question is from neet-botany cell-cycle-and-cell-division , and it was created by the author Mr. NARESH KUMAR K

Question

Which stage of cell division is affected if a plant cell has double the expected number of chromosomes and lacks a cell plate, and what is the resulting cellular condition?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Telophase and Cytokinesis
 **Related Topics**: Cell cycle, mitosis, polyploidy
 **Prerequisites**: Understanding of the cell cycle, telophase, cytokinesis, and polyploidy.
## SOLUTION PATHWAY
**Given Information**:
  * Plant cell with double the expected number of chromosomes.
  * Lack of a cell plate.
**Method & Steps**:
 1. Identify the affected stage: The absence of a cell plate points to a problem in cytokinesis, which typically occurs after telophase.
  Reasoning: The cell plate forms during cytokinesis in plant cells. Its absence indicates that cytokinesis has failed.
  Formula/Rule: None directly applicable.
 2. Determine the resulting condition: The doubled chromosome number signifies polyploidy, a condition where a cell has more than two complete sets of chromosomes.
  Working:  The failure of cytokinesis prevents the separation of the duplicated chromosomes into two daughter cells, resulting in a single cell with a doubled chromosome number.
  Key Point: Polyploidy is more common in plants than in animals.
 3. State the conclusion: The affected stage is telophase/cytokinesis, and the resulting condition is polyploidy.
  Result: Telophase/Cytokinesis; polyploidy.
  Verification: The given information directly supports the conclusion. The absence of a cell plate and doubled chromosomes indicate failed cytokinesis during or after telophase.
 ## OPTION ANALYSIS
A :x: Prophase; aneuploidy - Incorrect.  Aneuploidy is an abnormal chromosome number, but the problem is not in prophase. The doubled chromosome number indicates polyploidy, not aneuploidy.
B :x: Metaphase; apoptosis - Incorrect. Apoptosis is programmed cell death. The observation doesn't indicate apoptosis; instead, it indicates failed cytokinesis.
C :x: Anaphase; nondisjunction - Incorrect. Nondisjunction happens during anaphase, but the problem here is the failure of cytokinesis, not nondisjunction.
D ✓: Telophase/Cytokinesis; polyploidy - Correct. This accurately identifies the affected stage and the resulting condition.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the different phases of mitosis and their respective events.
  2.Not recognizing the significance of the cell plate's absence in plant cell division.
 **Quick Tips**:
  1.Remember the sequence of events in the cell cycle.
  2.Polyploidy is a common outcome of failed cytokinesis in plants.

Mr. NARESH KUMAR K · Answer

Prophase; aneuploidy

Mr. NARESH KUMAR K · Answer

Metaphase; apoptosis

Mr. NARESH KUMAR K · Answer

Anaphase; nondisjunction

Mr. NARESH KUMAR K · Answer

The correct Option is "Telophase/Cytokinesis; polyploidy"

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