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The cell cycle

The cell cycle is the process of cell replication.

Cells spend most of their life in interphase . Interphase can be sub-divided into the following stages:

  • $$\ce{G0}$$: if a cell is not dividing, it stays in this phase.
  • $$\ce{G1}$$ (gap phase 1) : Cell growth while performing normal function.
  • S phase (synthesis) : DNA is replicated. Chromosomes move from being single DNA strands to two strands (sister chromatids) joined at a centromere.
  • $$\ce{G2}$$ (gap phase 2) : Further cell growth and microtubule synthesis. Preparations for cell division now complete.

After G2, cells are ready for mitosis . During mitosis, the genetic material divides. This stage only takes up 10% of the total cell cycle!

Remember, a cell entering mitosis already has two copies of diploid genetic material.