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DNA content at various cell cycle phases (C = haploid DNA content):

AG1 = 2C, S = 4C → 4C, G2 = 4C, end of M = 2C per daughter
BG1 = C
CAll same
DG1 = 2C, S = 4C, G2 = 4C, end of mitosis = 2C
Answer & Solution
Correct answer: A. G1 = 2C, S = 4C → 4C, G2 = 4C, end of M = 2C per daughter
**Track DNA:** G1 (2C, before replication). S: 2C → 4C (gradual). G2 (4C, replication complete). **Mitosis:** 4C divided to 2C per daughter. **Chromosome count differs:** 2n in G1, G2, daughters still 2n in mitosis (counting chromosomes, not chromatids).
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