<prompt> DNA replication takes place in which phase of cell?MG1G2S  <response>: CELL CYCLE : In G1 gap 1 phase ,the cell prepares for DNA synthesis. DNA synthesis occurs during Ssynthesis phase of the cell cycle. During the S phase, DNA is completely replicated ,but only once. Cell prepares for mitosis in G2 gap 2 phase, when proteins necessary for daughtercells are synthesized. Then the cells enters into the Mmitotic phase , when chromosomes are visible under microscope. The whole cycle lasts about 24hrs ;out of which M phase is only 1-2 hrs.Those cells which are not in division are said to be in G0 phase. Cell cycle, cyclins, CDKs ,Rb protein ,etc REF:DM VASUDEVAN TEXTBOOK ;7th EDITION ;Page no :582. 