Solution:

(a) The spindle fibers would be unable to reach chromosomes if the nuclear membrane failed to dissolve. As a result, chromosomes would be unable to reach the cell’s opposite poles.

(b) If DNA duplication does not occur, the cell may be unable to progress to the M phase. The cell cycle will come to an end as a result of this and the cell will enter an inactive stage called the G0 stag.

(c) If the centromeres do not divide, one of the daughter cells will receive a complete pair of chromosomes while the other will receive none.

(d) If cytokinesis does not occur, a cell with a multinucleate state is created. It will result in polyploidy.