Interphase is the first phase of the cell cycle and is the longest phase. It is made up of the 1st Growth Phase, the Synthesis Phase and the 2nd Growth Phase. Interphase is sometimes known as the resting phase because no division actually takes place. At each stage in interphase there is a "checkpoint" to make sure that no mistakes are carried through to the next stage
1st Growth Phase (G1):
- protein synthesis and organelle synthesis takes place
- normal cell metabolism
- Checkpoint: repair any damaged chromosomes
Synthesis Phase (S phase):
- DNA replication takes place -> DNA is copied and proofread by DNA polymerase
- Checkpoint: stop cycle if chromosomes haven't copied
2nd Growth Phase (G2):
- More cytoplasm and proteins are produced (proteins needed for division)
- Checkpoint: repair any damaged DNA
Comments
No comments have yet been made