Question

In which stage D.N.A. duplication occurs?

• A. $G_1$
• B. $G_2$
• C. S
• D. In all

Answer 1

Answer: (C)

S

There are 4 phases of the cell cycle, namely G${}_1$ phase, S phase, G${}_2$ phase and M phase. During G${}_1$ phase or gap 1 phase, the cell increases in size. Also, various proteins are synthesized in this phase. During S phase or synthesis phase, the DNA replication or duplication takes place. During G${}_2$ phase, cell continues to grow until it enters the M phase or mitosis phase. Cell division takes place in M phase.

Thus, the correct answer is 'S'.