Color the aster pink and the spindle green. The centrioles form a star shaped structure called the aster and a spindle forms between them. The nuclear membrane breaks apart and the chromatin condenses into chromosomes. Color the centrioles red and the nuclear membrane yellow. At this time the cell grows, the DNA replicates, and organelles grow in preparation for cell division. A pair of centrioles are present (but inactive in the cytoplasm) and the nucleolus is visible. During this phase, the DNA is uncoiled and is called chromatin. A cell spends most of its time in this "in between" phase performing cell activities like cellular respiration, osmosis, and for plant cells, photosynthesis. A phase called interphase is not actually part of mitosis, but is the resting phase that the cell is in when it is not dividing.ฤก. The cell cycle has five phases, but mitosis (nuclear) division occurs in four steps: Prophase, Metaphase, Anaphase, and Telophase. Cell division includes a very important process called MITOSIS where the nucleus creates a copy of all of its DNA so that each new cell is an exact copy of the parent cell and contains the exact same number of chromosomes.
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