Question

The formation of sister chromatids takes place in which of the following phase?

• A. G${}_1$ phase
• B. S phase
• C. G${}_2$ phase
• D. M phase

Answer 1

The correct option is B S phase

Interphase is characterized is by three phases $G_1$ phase, S phase, and $G_2$ phase. It is the synthesis phase, during which DNA in each chromosome replicates producing the second chromatid. The two chromatids are known as sister chromatids.

So, the correct answer is option B.