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Why is cell division important?
(what processes involve cell division?)
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Why is cell division important?
reproduction maintenance repair immune response growth development cancer
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What are chromosomes made of?
In order for the new cells to have all the same characteristics as the parent cell, what must be passed along to each of them? hereditary material - chromosomes What are chromosomes made of? genes (DNA), and protein
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Chromosome
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Cell Division - 2 major stages
1. mitosis – genetic material “divided” 2. cytokinesis - cytoplasm divides (these stages overlap each other)
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Chromatin
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Interphase time period between cell divisions chromatin replicated (replication of chromatin = replication of DNA = replication of chromosomes)
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funny song and video corny
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Double Stranded Chromosome
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Chromatids Centromere
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Spindle fibers
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Mitosis Metaphase
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Mitosis in an animal cell
6 - interphase 4 - anaphase 2 - prophase 3 - metaphase 5 - telophase 1 - interphase
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Mitosis in a plant cell 6 - interphase 2 - prophase 4 - anaphase
5 - telophase 3 - metaphase 1- interphase
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6 9 3 1 8 2 5 4 7
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Eukaryotic Cell Division 2 major stages
1. mitosis - nucleus of cell divides forming nuclei 2. cytokinesis - cytoplasm divides (these stages overlap each other)
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Interphase time period between cell divisions chromatin replicated (replication of chromatin = replication of DNA = replication of chromosomes)
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Prophase 1st stage of mitosis nuclear membrane disintegrates spindle forms chromosomes become visible (they form from coiling of chromatin)
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Metaphase chromosomes line up in middle of cell chromosomes become attached to the spindle apparatus of centromeres
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Anaphase centromeres replicate and separate spindle fibers shorten, spindle fibers pull the chromatids apart and collect them near the poles
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Telophase new nuclear membrane forms chromosomes become long and thin cytoplasm begins to divide
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Cytokinesis division of the cytoplasm of a cell after division of nucleus
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When a cell is deprived of ATP, mitosis stops.
What does this tell you about mitosis?
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spindle fiber formation, chromosome movements, require ATP
DNA replication, spindle fiber formation, chromosome movements, require ATP
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The Cell Cycle
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Can you name the stage of each photo of mitosis?
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How is cell division different in plant and animal cells?
Plant cells - no centrioles - cell membrane does not pinch in as in animal cells - form new cell wall (cell plate) between new cells
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