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In the cell cycle of a typical eukaryote, the sequence of events operating at the time of cell division is
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- S phase → G2 phase → G1 phase → M phase
- S phase → M phase → G1 phase → G2 phase
- S phase → G2 phase → M phase → G1 phase
- S phase → G1 phase → M phase → G2 phase
Correct Option: C
In eukaryotes, the cell cycle consists of four discrete phases: G1, S, G2, and M. The S or synthesis phase is when DNA replication occurs, and the M or mitosis phase is when the cell actually divides. The other two phases — G1 and G2, the so-called gap phases — are less dramatic but equally important. During G1, the cell conducts a series of checks before entering the S phase. Later, during G2, the cell similarly checks its readiness to proceed to mitosis.