Question

Human chromosomes undergo structural changes during the cell cycle. Chromosomal structure can be best visualized if a chromosome is isolated from a cell at

• A. $G1$ phase
• B. $S$ phase
• C. $G2$ phase
• D. $M$ phase

Answer 1

The correct option is D $M$ phase

In cell cycle, there are growth phase and mitosis. In the growth phase, the chromosomes are in form of chromatin structure i.e., loosely arranged so not able to see properly in the growth phase. But in mitosis (division phase) the third stage is Metaphase where the chromosome is most compact so can be visualized. Thus, the correct option is D