Chapter 10 section 2 MITOSIS How do little elephants grow up to be BIG elephants? Why do animals shed their skin? I. Reasons cells reproduce through Mitosis A. Growth B. Repair C. Replacement II. Cell Cycle A. Def: The life of a cell B. Stages of the cycle 1. Interphase 2. Mitosis a. Prophase b. Metaphase c. Anaphase d. Telophase 3. Cytokinesis C.Stages 1. INTERPHASE a. Some cells are always in this stage ex. nerve cells b. Prepares for cell division ex. Copying DNA Label: nucleus, nuclear membrane, chromatin 2. MITOSIS a. PROPHASE 1. nuclear membrane & nucleolus fade & DISAPPEAR 2. centrioles APPEAR; move to opp. ends of cell, release SPINDLE FIBERS 3. Chromosomes FORM Label: chromosomes, spindle fibers, centrioles b. METAPHASE 1. chromosomes LINE UP IN MIDDLE of cell 2. spindle fibers stretch & attach to CENTROMERES Label: chromosomes, centromeres, spindle fibers, centrioles c. ANAPHASE 1. centromere splits in HALF 2. Chromosomes SEPARATE into CHROMATIDS; move to opposite ends of cell 3. centrioles pull spindle fibers back in Label: chromatids, centromeres, spindle fibers, centrioles d. TELOPHASE 1. centrioles & spindle fibers fade & DISAPPEAR 2. nuclear membrane REAPPEARS; forms around CHROMATIDS 3. cell stretches out Label: Chromosomes, nuclear membrane. 3. CYTOKINESIS SPLITTING of cytoplasm to make 2 new cells III. Plants vs. Animals PLANT CELLSANIMAL CELLS 1. have NO centrioles 1. have centrioles 2. CELL PLATE forms in cytokinesis to separate 2 new cells 2. CLEAVAGE FURROW forms in cytokinesis separate 2 new cells Cell wall prevents the cells from pinching in, so a cell plate formsl Flexible cell membrane allows the cytoplasm to pinch inhtml Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase REMEMBER! I Interphase P Prophase M Metaphase A Anaphase T Telophase C Cytokinesis IPMATC