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 contaning more number of chromosomes as compared to other dividing cells. This would results in

• A. Polyploidy
• B. Somaclonal variation
• C. Polyteny
• D. Aneuploidy

Answer 1

Answer: (A)

Polyploidy

Answer 2

Explanation:

TERMS USED IN THE QUESTION:

1. Telophase: The final stage of cell division, where chromosomes have reached opposite poles of the cell and begin to decondense.
2. Cell plate: As we are observing a plant cell, a cell plate is a structure that forms during cytokinesis (the division of the cytoplasm), which will eventually become the new cell wall of the daughter cells.

TERM USED IN THE ANSWER:

1. Polyploidy is a condition where cells have multiple sets of chromosomes

• In plant cells, division typically involves the formation of a cell plate to create a new cell wall.
• Now, in our case, cell plate formation doesn’t occur, which suggests that cytokinesis wasn't complete.
• Due to this, the cell ends up with double the normal number of chromosomes. This condition is called polyploidy.