What is the process by which Prokaryotic cells divide called? What are the four phases of Mitosis? Define Mitosis and cytokinesis. What changes in cell structure would result if cytokinesis doe not occur after mitosis? Describe and compare the process of cytokinesis in animal cells and plant cells. How is the cell cycle controlled? Why must the progression of cells through the cell cycle be regulated? Compare and contrast mitosis and meiosis.