Question

DNA replication occurs during

• A. M phase
• B. $G_1$ phase
• C. $G_2$ phase
• D. S phase

Answer 1

The correct option is D S phase

Interphase has a long duration and during this phase the cell prepares to divide by undergoing cell growth and DNA replication. Interphase is further divided into $G_1$ , S and G${}_2$ phases.
DNA replication (duplication of DNA) occurs during the S phase of the cell cycle. The total content of DNA doubles and gets equally distributed in the daughter cells after cell division.