Question

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

A. Only G2
B. G1 and S
C. G0 and G1
D. G2 and M

Answer 1

The amount of DNA in a cell is at a 4C level during the G2 and M phases of the cell cycle. This follows the duplication of DNA during the S phase from an initial 2C level.

Step-by-step explanation:

During which phase(s) of the cell cycle, the amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C? The answer is D. G2 and M. During the S phase, the cell replicates its DNA, going from 2C to 4C by the end of this phase. In the G2 phase, the cell has twice the amount of DNA (4C) as it did at the beginning (2C), since DNA replication has already occurred but the cell has not yet divided. This increased level of DNA is maintained throughout the G2 phase and wraps into the mitotic (M) phase of the cell cycle. It is during the M phase that this duplicated DNA is divided equally into two daughter cells as part of mitosis and cytokinesis.