Which one is correct about S-phase (synthetic phase)?
I. It occurs between G1 and G2
II. It marks the period during which DNA replicates
III. At the end of this phase DNA is doubled but the number of chromosomes remains unchanged
IV. As the DNA is doubled in this phase number of chromosomes is also doubled
V. Centrioles replicate in this phase
VI. Amount of DNA changes from 2C to 4C
VII. It is pre G2 and post G1 phase
(a) I, II, IV, V, VI, VII are correct                  (b) I, II, III, V, VI, VII are correct
(c) All are correct                                        (d) Only IV is correct

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