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:

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

Answer 1

The correct option is B Polyploidy

As mentioned in the question, a cell at telophase stage is observed by a student in a plant, which is not like other cells at telophase stage because there is no formation of cell plate and also the cell is containing more number of chromosomes as compared to the other cells, this state of a cell is known as polyploidy, which means having more than two paired sets of chromosomes.

During the process of polyploidization, sometimes chromosomes become multistranded. This process is called polyteny.
The plants produced from tissue culture are genetically identical to the original plant from which they are grown, so they are called somaclones. Sometimes they are not identical to the parent plant from which they are produced, such plants are called somaclonal variants.
A gain or loss of chromosomes from the normal 46 is called aneuploidy. A common form of aneuploidy is trisomy, or the presence of an extra chromosome in cells.