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Section 3.2 “Cell division is part of the cell cycle” Do Now • • • • Label the following diagram 1- chromosome 2- chromatid 3- centromere Objectives • Describe the main events of the cell cycle • Differentiate interphase from mitosis • Construct a cell cycle model from paper plates. Cell Cycle • “normal sequence of development and division of a cell” • Contains 2 parts for eukaryotes – Interphase – M-phase (Mitosis) Interphase • There is no division in interphase, just growth. – G1: organelles duplicate, cell grows – S: DNA replicates (is copied) – G3: cell grows, prepares to divide M-phase (Mitosis • Mitosis= “nuclear division” • PMAT+ C – Prophase – Metaphase – Anaphase – Telophase – Cyokinesis Plate Models • You are now going to make a study tool using paper plates. • Follow along while I show you how to fold the plate, use the directions as a guide. • Pass out plates Mitosis • Creates 2 genetically IDENTICAL daughter cells. Prophase – DNA condenses to form chromosomes. – The nucleus dissapears. Metaphase – Chromosomes line up in the middle of the cell at the “equator” Anaphase – Chromatids split – Pulled to opposite sides of the cell Telophase – 2 nuclei form – Nuclear membrane forms around each group of chromosomes. – The chromosomes become chromatin again. Cytokinesis – Division of the cytoplasm. – Occurs differently in plant and animal cells. – 2 new daughter cells form. Cytokinesis • Animal Cells: – Membrane pinches together and forms a cleavage furrow until the cells separate. Cytokinesis • Plant Cells: – Cell plate forms which becomes the cell wall and divides the two cells.