Duplication of centrioles is observed during

Step-by-step solution

The cell cycle is divided into two phases - Interphase and Mitosis phase or the M phase. Interphase is further divide into 3 phases - the Gap 1 or G 1 phase, the Synthesis phase or S phase and the Gap 2 or G 2 phase. G 1 phase is the interval between mitosis and initiation of DNA replication during which the cell is metabolically active and grows but does not replicate. During the S or synthesis phase DNA synthesis and replication occurs. The amount of DNA in the cell doubles during this phase but the number of chr