Question

The chromosome of cell duplicates during the

• A. S - phase of cell cycle
• B. $G_1$ - phase of cell cycle
• C. $G_2$ - phase of cell cycle
• D. Prophase of cell division

Answer 1

The correct option is A S - phase of cell cycle

S-phase (synthesis phase) is the part of the interphase of cell cycle occurring between $G_1$ and $G_2$-phase. This is the phase in which DNA replication takes place, i.e., chromosomes are replicated.

So, the correct answer is option A.