WBCS.LIVE practice question

In which substage of interphase is DNA doubled?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. G1
  2. S
  3. G2
  4. G0

Correct answer and explanation

Correct answer: S

Explanation: In interphase, DNA replication occurs during the S-phase (Synthesis phase). 📚 Other Information: ▪️ Interphase has 3 stages: G₁, S, and G₂. ▪️ G₁: cell growth, protein synthesis. ▪️ S: DNA replication → chromosomes double. ▪️ G₂: preparation for mitosis (enzymes & proteins). ▪️ G₀: resting phase, no division. ▪️ Mitosis follows interphase. ▪️ Accurate DNA replication ensures genetic stability. ▪️ Errors in S-phase may cause mutations or cancer.