Cell Division
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Transcript of Cell Division
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Cell Division
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Why is Cell Division Important??
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DNADeoxyribonucleic Acid
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What is Deoxyribonucleic Acid?
Long thin molecule that stores genetic informationResponsible for the inheritance of traits.
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ChromosomesDNA coils into structures called CHROMOSOMES during cell division
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Chromosomes
CHROMATIDCENTROMERE
I’m a Chromosome!!
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Chromosome typesHuman chromosomes are arranged into two types
SEX CHROMOSOMES – determine sex of individual (X,Y)
All other chromosomes are called AUTOSOMES
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Diploid Cells•Most cells in your body are somatic•Contain 2 of each chromosome (this is the diploid number)
•46 total•23 homologous pairs
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BINARY FISSION• Prokaryotic
cells– bacteria
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Cell Division is a process where new body cells are made
• And the new cells (daughter cells) are identical to the parent cells
• How…and…Why???
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MITOSISIntelligent People Meet At Three
O’Clock”• INTERPHASE
• PROPHASE• METAPHASE• ANAPHASE
• TELOPHASE• CYTOKINESIS
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The Cell Cycle
• INTERPHASE– Time between cell divisions
• MITOSIS– Nucleus of cell divides
• CYTOKINESIS– Division of cytoplasm of cell
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INTERPHASE
• G1-cells grow
• S-DNA duplicateS
• G2-cell prepares for division
• G0-cells exit cycle-quit growing
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PROPHASE• DNA coils into
chromosomes
• Centrosomes appear– will later give out
spindle fibers
• Nuclear envelope disappears
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METAPHASE• Chromosomes
line up along middle of cell by the spindle fibers attached to centromeres
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ANAPHASE• Chromosomes
separate and move toward opposite poles of dividing cell
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TELOPHASE• Chromosomes reach opposite ends of cell
• Chromosomes decondense
• Membrane starts to form
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CYTOKINESIS• Cytoplasm of cell
divides
• Cell membrane pinches inward
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Metaphase
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Interphase
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Prophase
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Telophase
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Anaphase
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• 2 new things you learned today…
• Questions you still have…
• What information do you still need that you are missing?
• What still doesn’t make sense?
• Something else you would like to talk about that is related.