Before cell division and during the interphase, the cell DNA replicates. This event only occurs in the S phase, together with histones and other proteins synthesis. The part of the model represents the S phase is phase II
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The interphase occurs before cell division. It is composed of the G1, S, and G2 stages.
- During the G1 stage, the cell duplicates in size. The organelles and other cytoplasmatic structures duplicate. The high intense biochemical activity is characteristic of this stage.
- During the S stage occurs the DNI replication process. This is the only stage where DNA replicates. Histones and other associated proteins are also sinthesized.
- The G2 stage is the final one before the cellular division. Here begins the slow process of DNI condensation. Duplication of centrioles completes. Structures such as spindle fibers are assembled.
In the attached image you will find a graph showing the DNA content during the cell cycle, this is, how much DNA there is in the cell as the cycle goes on.
- X axe ⇒ Phases ⇒ I, II, III phases
- Y axe ⇒ Complete sets of DNA in the nucleus ⇒ 1 and 2 sets
The exponential growth occurs during the second phase, II. You can see how DNA content inhences from one single set to two sets of DNA.
Since DNA content duplicates during phase II, we can assume that the S phase of the interphase is represented by phase II in the graph, because this is the only stage in which DNA replicates.
So, the part of the model represents the S phase is phase II.
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You can learn more about the S phase at
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