AP Biology 2007-2008 Biology is the only subject in which multiplication is the same thing as division… Cell Cycle Overview Notes
AP Biology Uses of the Cell Cycle and Mitosis Growth Increasing number of cells. Cells do not increase in size. Tissue Repair Embryonic Growth Asexual Reproduction (Binary Fission)
AP Biology Stages of the Cell Cycle Interphase Stage G1 Period of cell growth Cell increases number of organelles Stage S DNA replication Stage G2 Preparation for mitosis Mitotic Phase Nuclear division. Nucleus and genetic information divide. Cytokinesis The actual physical division of the cell. Division of the cytoplasm and its contents.
AP Biology Interphase (longest stage of cell’s life) Divided into 3 phases: G 1 = 1 st Gap Cell doing its “everyday job.” Cell grows. S = DNA Synthesis G 2 = 2 nd Gap Prepares for division. Cell grows (more). Produces organelles, proteins, membranes. G0G0 signal to divide Cell is not dividing or preparing to divide.
AP Biology Cell cycle Cell has a “life cycle.” cell is formed from a mitotic division cell grows & matures to divide again cell grows & matures to never divide again G 1, S, G 2, M G1G0G1G0 epithelial cells, blood cells, stem cells brain / nerve cells muscle cells liver cells
AP Biology Cell Cycle Activity Directions: 1. Work with a small group at the lab tables. 2. Cut out one “wheel” and one arrow. 3. Create a hole the “wheel” and the arrow using a hole punch. 4. Use a brass brad to hold the two components together. 5. Describe what occurs in each phase on your cell cycle “wheel.” 6. Glue the cell cycle “wheel” into your notes. Objective: You will create a “wheel” to represent the cell cycle.