do now 1.31 objectives: 1.be able to draw and describe what happens during each stage of mitosis....
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Do Now 1.31Objectives:
1. Be able to draw and describe what happens during each stage of mitosis.
2. Be able to define cytokinesis, and describe how it is different in plant and animal cells.
Task:Draw the chromosomes of a cell with a diploid chromosome number of 6 during the G1 phase of
the cell cycle.
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Mitosis
• Mitosis is the process of a cell making two identical “daughter” cells.
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Mitosis and the Cell Cycle
• The cell cycle is sometimes simplified into just two stages:– Interphase: the parts of the cell cycle when the
cell is not actively dividing. Includes G1,S, and G2– Mitosis: the process of nuclear division
(chromosomes separating to form two new nuclei)
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Foldables Part Deux
• Add interphase to the outside of your foldable notes
G1 S G2 M I N T E R P H A S E
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Add the 4 Stages of Mitosis
• Prophase• Metaphase• Anaphase• Telophase
G1 S G2 M
P M A T I N T E R P H A S E MP A T
M I T O S I S
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What Happens During Each Stage of Mitosis
Chromosomes appear; nucleus disintegrates
Chromosomes line up in middle of cell
Chromosomes move apart
Chromosomes relax, new nuclei begin forming
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Prophase: Chromosomes become visible and the nucleus disintegrates
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Metaphase: Chromosomes Line Up in the Middle of the Cell
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Anaphase: Chromosomes Move Apart
Note: it is at this stage that the two chromatids of each chromosome are pulled apart.Now, each chromatid from the old chromosome is called a chromosome
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Telophase: Chromosomes uncoil, new nuclei develop
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What pulls the chromatids apart? Spindle fibers attached to centrioles
Centrioles
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PROTEINS DO IT ALL
Remember that proteins do almost all of the “work” a cell does.
PROTEINS connect the spindle fibers to centromeres
PROTEINS are what the centromeres, spindle fibers, and centrioles are made of
PROTEINS are what move the chromosomes through the cell
PROTEINS are what the DNA of a chromosome are coiled around
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Mitosis vs. Cytokinesis
• Mitosis specifically refers to the division of a cell’s nucleus.
• Cytokinesis is the process of the cell’s cytoplasm dividing. It begins during telophase
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Cytokinesis in Animal and Plant Cells
• In animal cells (and other cells without cell walls, a cleavage furrow develops.
• In plant cells a new cell wall is built. It is called a cell plate while under construction
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Homework
• Read pp. 150-151• Answer SR #3 & 5 on p. 151