Final answer:
The G2 phase is the shortest and final phase of interphase before mitosis, where the cell prepares for cell division by producing organelles and molecules necessary for chromosome manipulation and organizing spindle fibers.
Step-by-step explanation:
The phase being described is the G2 phase, which is the final part of interphase in the cell cycle. This phase is dedicated to preparations for mitosis, including the production of organelles and molecules that are necessary for cell division.
During the G2 phase, cells undergo a period of growth and final preparations for mitosis. The cell ensures that it has ample energy stores and synthesizes proteins essential for the upcoming process of chromosome manipulation. In this stage, certain organelles are replicated, such as centrioles in animal cells, important for organizing the spindle fibers during mitosis. Additionally, the cytoskeleton is broken down to provide the resources necessary for constructing the mitotic spindle. Only after these critical tasks are completed can the cell progress to prophase, which is the first stage of mitosis where the actual process of nuclear division begins. The G2 phase is crucial as it equips the cell with the tools needed for a successful division into two daughter cells during the mitotic phase.