Rebekah HaLeah Shteynman Marlon Whitney
The Cell Cycle
• period between cell divisions
• eukaryotic cells spend most time in
• includes g1, S, g2
Interphase
• first phase of mitosis
• duplicated chromosomes condense
• causes nucleolus to disappear
• spindle microtubules form
• originate from centrioles
• new pair forms during interphase near previous pair
Prophase
• middle phase/stage
• 2 kinetochores pull toward opposite poles
• While microtubules lengthen/shorted until chromosome lines up along equator with 1 kinetochore facing each pole
• sister chromatids separate and are pulled to opposite poles of the cell
Metaphase
• another phase of mitosis, sister chromatids separate
• Allows each kinetochore move its chromosome pole ward, nibbling off end of attached microtubule
• Each pole has a copy of chromosome
• Polar microtubules grab one another overlapping at equator, lengthen + push on one another forcing poles of cell apart
Anaphase
• a nuclear envelope forms around each group of chromosomes
• end stage
• Spindle microtubules disintegrate, nuclear envelope forms around each group of chromosomes
• Those revert to extended state, nucleoli reform
Telophase
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