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

G_{0}

and

G_{1}

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G_{1}

and S

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Only

G_{2}

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G_{2}

and M

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Solution

The correct option is C Only $G_{2}$
A cell cycle is divided into $G_{1}$ , S, $G_{2}$ and M phases. $G_{1}$ or first growth 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 $G_{1}$ phase will now have 4C DNA. $G_{2}$ phase is second growth phase where the DNA content remains the same 4C. M phase is the phase of division where DNA content either regains 2C level (mitosis) or becomes halved, i.e., 1C (in meiosis). $G_{0}$ phase is the phase of differentiation where the cell contains DNA in the same amount as its parent cell and does not divide further.

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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?

4

2

G_{1}

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