PATHOLOGY

Detailed explanation-1: -G1 phase (Gap 1) – G1 phase is the phase of the cell between mitosis and initiation of replication of the genetic material of the cell. During this phase, the cell is metabolically active and continues to grow without replicating its DNA.

Detailed explanation-2: -During division, the cell undergoes 4 distinct stages termed G1, S, G2, and M (mitosis). These periods of activity are separated by regulatory checkpoints at major transition phases. These checkpoints include G0/G1 which regulates the entry of a quiescent cell back into the cycle, G1/S, and G2/M.

Detailed explanation-3: -In the G1 phase, cells enter the new cycle. After the G0 phase and receiving positive signals, the cell cycle starts.