the cell cycle presentation teacher version 08
TRANSCRIPT
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The Cell Cycle
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Here is what we’re going to learn about.
PARENT CELL
2 DAUGHTER CELLS
CELL DIVISION
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The Stages of the Cell Cycle
STAGE 1: Interphase
STAGE 2: Mitosis
Prophase
Metaphase
Anaphase
Telophase
STAGE 3: Cytokinesis
NUCLEUS DIVIDES
CELL MEMBRANE DIVIDES
CELL GETS READY
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Phase 1: Growing
• The cell GROWS to its full size and produces the structures it needs.
• The cell may make new ribosomes and enzymes and copies are made of mitochondria.
THE CELL LOOKS AND ACTS PRETTY NORMAL IN THIS PHASE
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INTERPHASE - Growing
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• Cell grows to its normal size
• Cell makes a copy of its DNA (DNA REPLICATION)
• 2 Centrioles are copied to make a total of 4
INTERPHASE
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CENTRIOLECENTRIOLE
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Phase 2: Copying DNA
• The cell makes an exact copy of the DNA in its nucleus. This process is called DNA REPLICATION.
• Important step, because the new cells (daughter cells) must have an exact copy of the first cell’s (parent cell) DNA.
• After the Copying DNA Phase, 2 identical sets of DNA are in the parent cell.
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Phase 2: Copying DNA(occurs inside nucleus)
ORIGINAL
ORIGINAL
COPY
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What is Stage 2: Mitosis?
This is the 2nd Stage of the Cell Cycle.
• This is the stage during which the cell’s nucleus divides into 2 new Nuclei. During mitosis, 1 copy of the parent’s DNA is made for each of the 2 daughter cells.
• There are 4 phases in Mitosis: prophase, metaphase, anaphase, and telophase.
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MITOSIS:PROPHASE
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• Chromatin shrinks to make Chromosomes
• Spindle fibers are formed
• Membrane around nucleus breaks down
MITOSIS: PROPHASE
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CHROMOSOME• Made up of 2 chromatids held together by
a centromere.
• Chromatids are made of DNA.
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MITOSIS: METAPHASE
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• Chromosomes line up in middle of cell
• Spindle fibers grab onto centromeres of chromosomes
MITOSIS: METAPHASE
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MITOSIS: ANAPHASE
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• Centromeres split
• Spindle fibers pull chromatids to either side of cell
(CYTOKINESIS BEGINS: cell stretches out)
MITOSIS: ANAPHASE
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MITOSIS: TELOPHASE
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• Chromosomes stretch out and begin to turn back into chromatin
• Nuclei reform(CYTOKINESIS CONTINUES: cell pinches in the middle)
MITOSIS: TELOPHASE
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Phase 3: Preparing for Division
• The cell gets ready to divide.
• The cell produces structures that it will use to divide into new cells.
• The cell makes a copy of its 2 centrioles, to now have 4 of them.
• Once this step is over, the cell is ready to divide.
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Cytokinesis in an Animal Cell
BEFORE DURING AFTER
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• Each daughter cell is given equal organelles and 1 nucleus.
• Cell membrane splits, forming 2 new daughter cells.
ANIMAL CELL: CYTOKINESIS
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Cytokinesis in Plant Cells
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• A cell plate forms in the middle of the cell. • The cell plate turns into a cell membrane that cuts the cell into 2 daughter cells. • New cell walls then form around each of the daughter cells to protect them..
PLANT CELL: CYTOKINESIS
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How long do the 3 stages take?
HUMAN LIVER CELL
HOWLONGDOES THE WHOLETHINGTAKE?