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Review Question - QID 839

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QID 839 (Type "839" in App Search)
DNA replication occurs during which phase of the cell cycle?

M

16%

264/1658

S

60%

1002/1658

R

10%

170/1658

G1

9%

154/1658

G2

4%

59/1658

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The cell cycle consists of four distinct phases: initial growth (G1), DNA replication/synthesis (S), a gap (G2), and mitosis (M) (see illustration).

The G1 and G2 phases of the cell cycle represent the “gaps” or growth phases in the cell cycle that occur between DNA synthesis and mitosis. G0 cells are in a stable state and have not entered the cell cycle. During the S phase, the DNA is synthesized and replicated. During the M phase or mitosis, all genetic material divides into two daughter cells.

The cells are diploid (2N) in the G0 and G1 phases. The cells become tetraploid (4N) at the end of S and for the entire G2 phases. There is no R phase in the cell cycle.

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