G1 phase
G1 phase
G1 phase (pronounced "gee-one phase") is the first of four phases of the cell cycle that takes place in eukaryotic cell division. In the G1 phase, cells grow and monitor their environment to determine whether they should initiate another round of cell division.
Etymology
The term "G1 phase" is derived from the word "Gap 1". It is called so because it's the phase that occurs immediately after cell division (M phase) and before DNA replication (S phase). The "gap" refers to the period where the cell is preparing for the next phase.
Related Terms
- Cell Cycle: The series of events that take place in a cell leading to its division and duplication.
- Interphase: The phase of the cell cycle in which a typical cell spends most of its life. During this phase, the cell copies its DNA in preparation for mitosis.
- S phase: The part of the cell cycle in which DNA is replicated, immediately following the G1 phase.
- M phase: The phase of the cell cycle consisting of mitosis and cytokinesis, resulting in cell division.
- G0 phase: A period in the cell cycle in which cells exist in a quiescent state. G0 phase is viewed as either an extended G1 phase, where the cell is neither dividing nor preparing to divide, or a distinct quiescent stage that occurs outside of the cell cycle.
See Also
External links
- Medical encyclopedia article on G1 phase
- Wikipedia's article - G1 phase
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