View source for G1

G1 phase (or&nbsp;post-mitotic phase)&nbsp;is one of the four phases of the [[Cell cycle|cell cycle]] and occurs in stage one of [[Interphase|interphase]]. G stands for Gap and the 1&nbsp;represents first so&nbsp;the G1 phase is the&nbsp;first gap phase.&nbsp;During this phase, the cell increases in mass carrying out [[protein synthesis|protein synthesis]] and&nbsp;other cellular functions, ecxcept [[DNA replication|DNA replication]]. This phase includes the G1 checkpoint which is an important control point in the cell cycle. During this&nbsp;checkpoint&nbsp;the cell&nbsp;normally becomes committed to [[DNA synthesis|DNA synthesis]]. However, it can enter a quiescent resting state, [[G0|G0]], a paused stage where they can then enter G1. The [[Chromosomes|chromosomes]] each contain only one [[Molecule|molecule]] of [[DNA|DNA]] and are not visible <ref>Interphase website http://biology.uoregon.edu/reference/ort_mitosis/interphase.html</ref>.&nbsp;<br> 

It is contolled by activity of [[cyclin-dependent kinase|cyclin-dependent kinases]] <ref>Bruce Alberts, 2008, Molecular biology of the cell, 5th edition, New York, Garland Science</ref>.<br> 

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