Cell Cycle and Mitosis Outline The Cell Theory
- Slides: 20
Cell Cycle and Mitosis
Outline The Cell Theory Interphase Mitosis Cytokinesis
The Cell Theory There are three main ideas in the cell theory: 1) All living things are made up of one or more cells 2)The cell is the functional unit of life 3)All cells come from pre-existing cells
The Cell Cycle The cell cycle is a continuous sequence of cell growth and division The cell cycle consists of three stages: 1) Interphase 2) Mitosis 3) Cytokinesis
Outline The Cell Theory Interphase Mitosis Cytokinesis
Interphase The period between cell divisions Cells undergo their normal activities (obtaining energy, synthesizing products, repairing damage, etc. )
Interphase There are three stages in interphase: 1) G 1 phase 2)S phase 3)G 2 phase
Interphase G 1 phase “gap 1 phase” Cells carry out normal processes and prepare for S phase
Interphase S phase “synthesis phase” DNA is replicated for cell division
Interphase G 2 phase “gap 2 phase” Cells begin final preparations for cell division
Outline The Cell Theory Interphase Mitosis Cytokinesis
Mitosis The process of cell division There are four stages in mitosis 1) 2) 3) 4) Prophase Metaphase Anaphase Telophase
Mitosis Prophase Chromosomes condense (shorter and thicker) Nuclear membrane dissolves Nucleolus disappears
Mitosis Prophase Centrioles migrate to opposite poles Spindle fibres begin to form
Mitosis Metaphase Spindle fibres attach to the chromosomes Chromosomes move towards the centre of the cell
Mitosis Anaphase Chromosomes split Chromosomes are pulled to opposite poles
Mitosis Telophase Chromosomes reach opposite poles and lengthen Spindle fibres dissolve Nuclear membrane forms
Outline The Cell Theory Interphase Mitosis Cytokinesis
Cytokinesis The division of the cytoplasm and organelles Occurs after mitosis
Outline The Cell Theory Interphase Mitosis Cytokinesis