Cell cycle
G phase (First growth phase or Post mitotic gap phase)

The first phase within interphase, from the end of the previous M phase until the beginning of DNA synthesis, is called G (G indicating gap). It is also called the growth phase. During this phase, the biosynthetic activities of the cell, which are considerably slowed down during M phase, resume at a high rate. The duration of G is highly variable, even among different cells of the same species. In this phase, the cell increases its supply of proteins, increases the number of organelles (such as mitochondria, ribosomes), and grows in size. In G phase, a cell has three options.

The deciding point is called check point (Restriction point). This check point is called the restriction point or START and is regulated by G /S cyclins, which cause transition from G to S phase. Passage through the G check point commits the cell to division.
combination:two_responses