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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?

1. G0 and G1
2. G1 and S
3. Only G2
4. G2 and M

Correct answer: G2 and M

Solution

After S phase, each chromosome has been replicated, so the cell contains 4C DNA. This 4C amount persists through G2 and remains until the end of M phase, when division produces two daughter cells and the DNA per cell returns to 2C.

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