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Transcript
Name & Class: ____________________ Stages of Mitosis 1. Next to each diagram, write the name of the phase and a brief description of what is happening. Diagram Name Description • PROPHASE • • • • METAPHASE • Each chromosome splits in half and each half moves to opposite poles (ends of the cell) • • Chromosomes reach opposite poles Nuclear membrane forms around each set of chromosomes Chromosomes begin to decondense Telophases is followed by Cytokinesis ANAPHASE TELOPHASE Individual chromosomes are made up of 2 identical strands of genetic information. Chromosomes become visible and shorten and thicken Nuclear membrane fades Spindle forms Double-stranded chromosomes line up in the middle of the cell and attach to the spindle at the Centromere. • • 2. What is interphase? Interphase is the part of the Cell Cycle in which the genetic material inside the nucleus is duplicated and the cell grows in size (approximately doubles in size) in preparation for cell division. 3. What is Cytokinesis? Cytokinesis is the part of the Cell Cycle which follows Telophase, in which the cell splits into two daughter cells. The cytoplasm and organelles are divided equally between the 2 new daughter cells. 4. Draw the CELL CYCLE diagram which shows the entire life cycle of a cell. There are 2 main phases to the Cell Cycle: 1. Interphase 2. Division Phase • • • • The whole cell cycle of body cells typically lasts from 8 to 24 hours in humans. As the pie chart shows, the part of the cell during which the nucleus of the cell is dividing (mitosis) occupies approximately 10% of the time taken for the whole cycle. The Cytokinesis phase (part of the division phase) takes approximately half of this time. Most of the cell cycle is the period in which the cell is not dividing (called Interphase).