mitosis ch 8. 2 cell division. cell cycle interphase: interphase: –g1: cell grows –s: dna...
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Mitosis The process of dividing nuclear material The process of dividing nuclear materialTRANSCRIPT
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MitosisMitosisCh 8. 2 Cell DivisionCh 8. 2 Cell Division
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Cell CycleCell Cycle
Interphase: Interphase: –G1: Cell growsG1: Cell grows–S: DNA replicatesS: DNA replicates–G2: Organelles G2: Organelles replicatereplicate
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MitosisMitosis
The process of dividing The process of dividing nuclear materialnuclear material
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VocabVocabWRITE THESE DEFINITIONS ON TOP OF YOUR WRITE THESE DEFINITIONS ON TOP OF YOUR NOTES!NOTES! Microtubules: protein structures Microtubules: protein structures
that are part of a cell’s that are part of a cell’s cytoskeletoncytoskeleton– Spindle: a bundle of microtubules Spindle: a bundle of microtubules
that separate chromosomes during that separate chromosomes during mitosismitosis
– Centriole: microtubule structure that Centriole: microtubule structure that helps organize the spindle fibers helps organize the spindle fibers during cell divisionduring cell division
– Aster: microtubules surrounding the Aster: microtubules surrounding the centriolecentriole
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ProphaseProphasea.a. ChromosomesChromosomes become become
visible.visible.b.b. CentriolesCentrioles move to move to
opposite poles of the cell.opposite poles of the cell.c.c. Microtubules extend from Microtubules extend from
the centrioles to form the centrioles to form astersasters
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ProphaseProphase
d.d. Microtubules form spindle Microtubules form spindle fibers.fibers.
e.e. Spindle fibers become Spindle fibers become attached to centromeres.attached to centromeres.
f.f. Nuclear membraneNuclear membrane disappears.disappears.
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MetaphaseMetaphase
a.a. Centromeres of the Centromeres of the chromosomes line up chromosomes line up on the equatoron the equator..
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AnaphaseAnaphase
a.a. Centromeres divideCentromeres divide..b.b. ChromatidsChromatids move to move to
opposite poles.opposite poles.
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TelophaseTelophase
a.a. Chromosomes reach the Chromosomes reach the poles of the cell.poles of the cell.
b.b. Chromosomes Chromosomes uncoiluncoil..c.c. Spindle and asters Spindle and asters
disappeardisappear..d.d. Nuclear membrane forms.Nuclear membrane forms.
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Cytokinesis (in Cytokinesis (in animals)animals)a.a. Begins during late Begins during late
anaphase.anaphase.b.b. Cytoplasm is pinched off Cytoplasm is pinched off
by cell membrane.by cell membrane.c.c. Results in two new cells.Results in two new cells.
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Mitosis in plantsMitosis in plants
Main events are the sameMain events are the samePlants don’t have Plants don’t have
centrioles or asters.centrioles or asters. In cytokinesis, a In cytokinesis, a cell plate cell plate
forms between the new forms between the new cells.cells.
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The Rate of MitosisThe Rate of MitosisWRITE THESE DOWN!WRITE THESE DOWN! Cells undergo mitosis at different Cells undergo mitosis at different
rates.rates. Mitosis speeds up during an Mitosis speeds up during an
injury.injury. Mitosis slows down with aging.Mitosis slows down with aging. Cells that undergo very fast Cells that undergo very fast
uncontrolled mitosis form cancer.uncontrolled mitosis form cancer.
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Name the stage of each Name the stage of each cell.cell.
A
B
DC