In binary fission, the eukaryotic cell-cycle event that is missing is cytokinesis. This is the process by which the cell physically divides into two separate daughter cells. In binary fission, the cell simply grows and divides into two equal-sized daughter cells without undergoing cytokinesis. This means that the two daughter cells are still connected by a thin strand of cytoplasm, and they do not become fully separated until cytokinesis occurs at a later stage in the cell cycle.