Which of the following not correctly matches a phase of the cell cycle with its function?

(A) Second gap phase - Cytoplasmic growth continues

(B) First gap phase - Initiation of replication

(C) Interphase - Phase of preparation for cell division

(D) DNA synthesis phase - Doubling of number of chromosome in cell

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Solution

The correct option is D D
S (synthesis) phase starts when DNA synthesis commences; when it is complete, all of the chromosomes have been replicated, i.e., each chromosome consists of two sister chromatids. Thus, during this phase, the amount of DNA in the cell has doubled, though the ploidy and number of chromosomes are unchanged.

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Similar questions

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_{1} (g a p) - > S (D N A s y n t h e s i s) - > G_{2} (g a p) - > M (m i t o s i s)

G_{2}

G_{2}

Synthesis phase in the cell cycle is the replication of

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(A)	Second gap phase	-	Cytoplasmic growth continues
(B)	First gap phase	-	Initiation of replication
(C)	Interphase	-	Phase of preparation for cell division
(D)	DNA synthesis phase	-	Doubling of number of chromosome in cell