Final answer:
If a G1 cell is fused with a cell in the M phase, the G1 cell will bypass the G2 phase and directly enter the mitotic phase.
Step-by-step explanation:
If you fuse a G1 cell to a cell in the M phase, the G1 cell will enter the M phase without going through the normal checkpoints. This means that the G1 cell will skip the G2 phase and directly enter the mitotic phase of the cell cycle. The mitotic phase is the phase during which the duplicated chromosomes are aligned, separated, and moved to opposite poles of the cell, and then the cell is divided into two new identical daughter cells.