During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C? (a) G 0 and G 1 (b) G 1 and S (c) Only G 2 (d) G 2 and M
Option C A cell cycle is divided into G 1 S, G 2 and M phases. G 1 or first growth phase is followed by S phase or synthesis phase. DNA replication occurs in S phase and DNA amount doubles up i.e., a cell with 2C DNA in G 1 phase will now have 4C DNA. G 2 phase is second growth phase where DNA content remains 4C. M phase is the phase of division where DNA content either regains 2C level (mitosis) or becomes halved i.e. 1C (in meiosis). G 0 phase is the phase of differentiation where cell contains DNA as in the same amount as its parent cell and does not divide further
