Which one is CORRECT about s-phase (synthetic phase)?
I. It occurs between $G_{1}$ and $G_{2}$
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.

I,II,IV,V are correct

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I,II,III,V are correct

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All are correct

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Only IV is correct

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Solution

The correct option is B I,II,III,V are correct
The S phase occurs between the G1 and the G2 phase. DNA replicates during this phase and the chromosome number remains unchanged. Centrioles also duplicate in this phase.
So, the correct option is 'I, II, III, V'.

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Similar questions

G_{1}

G_{2}

	List I		List II
(a)	S Phase	(i)	Proteins are synthesized
(b)	G₂Phase	(ii)	Inactive phase
(c)	Quiescent stage	(iii)	Interval between mitosis and initiation of DNA replication
(d)	G₁Phase	(iv)	DNA replication

Column - I	Column - II
(a)	$G_{1}$ phase	(i)	Cell grows and organelle duplication
(b)	S phase	(ii)	DNA replication and chromosome duplication
(c)	$G_{2}$ phase	(iii)	Cytoplasmic growth
(d)	Metaphase in M-phase	(iv)	Alignment of M-phase chromosomes

G_{2}

_{1}

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