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The full form of G1 phase is Gap one phase. G1 os also called first gap phase. Is there any specific meaning of " gap" here ?

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The $G_1$ gap is the period between the last cell division and that start of DNA replication (synthesis). That's what "gap" means here. A period of time between two events. It's often described as time spent synthesizing proteins, but I prefer to think about it as the period before the signal to start synthesis lands. A cell can do any number of things in the meantime: synthesize proteins, grow, interact with other cells, move, differentiate, enter and exit $G_0$...

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Albert's has a good chapter on the overview of the cell cycle and on the control system

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