<prompt> Inonizing radiation affects which stage of cell cycleG2SG1G2G2MG0G1  <response>: Ref Robbins 8e p 286, Harrison 17e p516; 9e p289 The G2M checkpoint ministers the completion of the DNA replication and checks whether the cell can safely intiates the mitosis and separate sister chromatids,this checkpoint is paicularly impoant in cells exposed to inonizing radiation , cells damaged by inonizing radiation activates G2M Check point and. Arrest in G2 