Question

In which phase of the cell cycle DNA doubles and chromosomes replicate?

• A. S period
• B. $G_1$ phase
• C. $G_2$ phase
• D. metaphase

Answer 1

The correct option is A S period

• The Cell cycle is divided into 2 phases the M phase and the interphase.
• The Mphase is where the actual cell division takes place, while interphase is the one where the cell rests and grows between the 2 consecutive cell division.
• The interphase is divided into G1, S and G2 phase where the G1 phase takes place after the cell division here the cells rest before it starts for the next cell division.

The S phase is were the DNA or the genetic material of the cell is replicated and the genetic material is doubled the amount so that it can be divided between the daughter cells.

The G2 phase takes place after the S phase and before the Mphase where it prepares for the cell division.

Therefore the answer option 'S period' is correct.