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

Question

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Chromosome number abnormalities during cell division
	**Related Topics**: Mitosis, Telophase, Cytokinesis, Ploidy
	**Prerequisites**: Understanding of mitotic stages, chromosome number changes, cell plate formation
## SOLUTION PATHWAY
**Given Information**:
	* Cell is at telophase.
	* No cell plate formation.
	* Increased chromosome number compared to normal cells.

**Method & Steps**:
	1. **Identify the abnormality**: Lack of cell plate in telophase indicates that cytokinesis (cell division) is not occurring properly.
		Reasoning: Cell plate formation is crucial for separating daughter cells during cytokinesis.
	2. **Relate the abnormality to chromosome number**: If cytokinesis fails, the duplicated chromosomes remain within the same cell.
		Reasoning: This leads to a doubling of the chromosome number in one cell.
	3. **Identify the resulting condition**: Increased chromosome number in multiples of the basic haploid number is called polyploidy.
		Reasoning: Aneuploidy is an abnormal number of chromosomes, not multiples. Somaclonal variation are genetic variations in plants produced from tissue culture. Polyteny is a condition where chromosomes have many DNA strands resulting in a very large chromosome, but this does not relate to whole cell division.

Result: Polyploidy
		Verification: The scenario describes a failure of cytokinesis, leading to doubled chromosome content, which is the definition of polyploidy.
 ## OPTION ANALYSIS
[A] :x: Aneuploidy refers to a condition with an abnormal number of chromosomes that is not a multiple of the haploid number. This is not the case here.
[B] ✓: Polyploidy refers to having more than two sets of chromosomes (e.g., triploid, tetraploid). The lack of cell plate formation leads to a doubling of the chromosome number, resulting in polyploidy.
[C] :x: Somaclonal variation is the variability observed in plants regenerated from tissue culture, not a direct result of failed cell division in this scenario.
[D] :x: Polyteny refers to the condition of giant chromosomes with multiple DNA strands, it is not a result of failed cell division.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing aneuploidy and polyploidy: Aneuploidy is an individual chromosome number change, while polyploidy involves whole sets of chromosomes.
		2. Misinterpreting somaclonal variation: Somaclonal variation occurs in tissue culture, not directly during mitotic abnormalities in the field.
	**Quick Tips**:
		1. Remember that a failure of cytokinesis will lead to a change in the number of sets of chromosomes.
		2. Visualize the process of mitosis and cytokinesis to understand the consequences of a missing cell plate.

Mr. NARESH KUMAR K · Answer

Aneuploidy

Mr. NARESH KUMAR K · Answer

The correct Option is "Polyploidy"

Mr. NARESH KUMAR K · Answer

Somaclonal variation

Mr. NARESH KUMAR K · Answer

Polyteny

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