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Transcript
Why do cells divide? •Reproduction •Growth •Repair How does the cell know how to divide? The DNA has the instructions for all of the cell’s activities. The sequence of development and division of a cell 3 Parts 1. Interphase - Preparation 2. Mitosis – Nuclear division 3. Cytokinesis – Splitting How long does it take? • Adult human cell: ~24 hrs • 18-20 hours in interphase • 2 hours in mitosis • Embryonic cells: 30 min. What happens •Cell doubles in size •DNA replicates •Organelles double in number What happens •DNA forms chromosomes •Spindle forms •Centrioles move toward opposite poles •Nuclear membrane begins to disappear What happens •Nucleus has disappeared completely •Chromosomes line up in the middle of the cell “equator” What happens •Centromeres divide •Chromatids separate and move to opposite poles What happens •Nuclear membrane forms around each group of chromosomes •Chromosomes unwind •Cytokinesis begins What happens •Cytoplasm divides •One cell becomes 2 cells Pg. 111
