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Question

During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C?


A

G0 and G1

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B

G1 and S

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C

Only G2

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D

G2 and M

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Solution

The correct option is C

Only G2


A cell cycle is divided into G1, S, G2 and M phases. G1 or first growth phase is followed by S phase or synthesis phase. DNA replication occurs in S phase and DNA amount doubles up i.e., a cell with 2C DNA in G1 phase will now have 4C DNA. G2 phase is second growth phase where DNA content remains 4C. M phase is the phase of division where DNA content either remains 2C level (mitosis) or becomes halved i.e. 1C (in meiosis). G0 phase is the phase of differentiation where cell contains same amount of DNA as its parent cell and does not divide further.


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