Related Formula
G₁$G_1$: Metabolically active growth
S: DNA replication (2C arrow 4C$2C \rightarrow 4C$)
G₂$G_2$: Protein synthesis
M: Actual division
Core Logic
- G₁$G_1$ phase: Cell is metabolically active and continuously grows without DNA replication arrow$\rightarrow$ II
- S phase: DNA synthesis occurs and DNA doubles arrow$\rightarrow$ III
- G₂$G_2$ phase: Protein synthesis occurs in preparation for mitosis arrow$\rightarrow$ IV
- M phase: Actual cell division occurs arrow$\rightarrow$ I
Step 1: Match Verification
Matching pairs: A-II, B-III, C-IV, D-I. This matches Option (1).
Pattern Recognition
S-phase = DNA synthesis/doubling. M-phase = Actual division. Instant match elimination gives option 1.
Chapter Mix
Class 11 Biology: Cell Cycle and Cell Division