Cell Cycle

The cell cycle begins when a new cell forms from the division of a parent cell.

The Eukaryotic Cell Cycle

The cell cycle has two main stages:

• interphase (G_1, S, and G₂)

• and cell division (M phase and cytokinesis)

Cell Cycle Stages

• Interphase - the stage where the cell grows and matures.

• Cells spend 90% of their lifetime in interphase.

• Interphase has three phases: G₁ phase, G₂ phase, and S phase.

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Interphase

G₁ - cell is growing by making carbohydrates, lipids, and proteins.

Nerve cells will exit phase G₁ and enter phase G₀.

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G₁ Phase

S Phase = Synthesis Phase

S Phase - DNA replication

​S Phase

G₂ Phase - period of growth.

All organelles and membranes are copied and the cell prepares for mitosis.

​G₂ Phase