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NEET 2016 Phase 2 · BiologyCell cyclePrevious Year Question

During cell growth, DNA synthesis takes place in

Answer: (A) S phase. Answer: S phase Solution: DNA synthesis (replication) occurs only during the S (synthesis) phase of interphase, when the amount of DNA per cell doubles from 2C to 4C without any change in chromosome number.

  1. A.S phase✓
  2. B.G1 phase
  3. C.G2 phase
  4. D.M phase

Correct Answer

(A) S phase

Solution & Explanation

Answer: S phase Solution: DNA synthesis (replication) occurs only during the S (synthesis) phase of interphase, when the amount of DNA per cell doubles from 2C to 4C without any change in chromosome number. G1 is the gap before replication when the cell grows but does not replicate DNA, and G2 is the gap after replication when proteins for mitosis are made. M phase is the actual division stage, not DNA synthesis. NCERT Reference: Ch 10, p.121, line 40 — "DNA synthesis or replication takes place"

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