First gap phase in cell cycle is

before DNA replication

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after karyokinesis

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after duplication of centrioles

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after DNA replication

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Solution

The correct option is A before DNA replication
Cell cycle includes a non-dividing phase, interphase and a dividing phase, mitotic phase.

Interphase has a long duration and during this phase the cell prepares to divide by undergoing cell growth and DNA replication. Interphase is further divided into $G_{1}$ , S and $G_{2}$ phases. “G” stands for gap and growth happens during this phase.
First gap phase is the $G_{1}$ phase. It is a phase of interphase before DNA replication. After the G $_{1}$ phase, the cell undergoes DNA replication in S phase.

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Similar questions

(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

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}

_{o}

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