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HOW DO CELLS PRODUCE NEW CELLS?
Chapter 2-9
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CELL DIVISION When you were small, you did not have a lot of cells. While you were growing up, your cells produced more cells. Most cells are able to produce and make new cells. This process is called CELL DIVISION = MITOSIS.
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The nucleus controls cell division.
CHROMOSOMES The nucleus controls cell division. Inside the nucleus are chromosomes. Chromosomes are made of chromatin. Chromosomes will decide the characteristics of future organism. Chromatin
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MITOSIS Mitosis has 4 phases (steps): 1. PROPHASE 2. METAPHASE 3. ANAPHASE 4. TELOPHASE
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PROPHASE The chromosomes become thick and shortened.
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METAPHASE Chromosomes line up across the center of the cell.
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ANAPHASE Chromosomes copy, split and separate.
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TELOPHASE The cell membrane pinches together in between the two nuclei.
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DAUGHTER CELLS After mitosis is finished, the old cell makes two identical daughter cells.
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Mitosis in animal and plant cells
Animal cells Plant cells In animal cells, the cell membrane pinches to make two cells. In plant cells, a new cell wall and new cell membrane form down the middle of the cell. They form a wall between the two new nuclei.
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MITOSIS CYCLE
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MITOSIS CYCLE
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MITOSIS ANIMATIONS hill.com/sites/ /student_view0/chapter2/animat ion__mitosis_and_cytokinesis.html
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Checking concepts: What is mitosis?
Mitosis- is a division of a nucleus (a cell)
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What controls cell division?
The nucleus controls the cell division.
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What is metaphase? What is happening during metaphase?
Chromosomes line up across the center of the cell.
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Where are chromosomes located?
Chromosomes are located in the nucleus of a cell.
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What is anaphase? What is happening there?
Chromosomes copy, split and separate
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What are daughter cells?
Daughter cells are two identical cells formed as a result of cell division.
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How is cell division in plants different form cell division in animals?
In plant cells, the cell membrane does not pinch together to form two daughter cells. A new cell wall and cell membrane form down the middle of the cell.
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Fill in blanks. In the___________, chromosomes line up across the center of the cell. The chromosomes become thick and shortened in the ______________. Chromosomes are inside the ___________. In plant cells, after telophase, a new _______________ and a new ___________ is formed. ______________ controls a cell division.
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