Recall that one approach to the study of cell cycle regulation has been to fuse cultured cells that are at different stages of the cell cycle and observe the effect of the fusion on the nuclei of the fused cells (heterokaryons). when cells in g1 are fused with cells in s, the nuclei from the g1 cells begin dna replication earlier than they would have if they had not been fused. in fusions of cells in g2 and s, however, nuclei continue their previous activities, apparently uninfluenced by the fusion. fusions between mitotic cells and interphase cells always lead to chromatin condensation in the nonmitotic nuclei. part a based on these results, identify each of the following statements about cell cycle regulation as probably true (t), probably false (f), or not possible to conclude from the data (np). sort each statement into the appropriate bin.