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Transcript
Mitosis Preparation For Mitosis ● S stage: DNA is copied ● G2 stage: organelles and molecules necessary for mitosis are produced Stages Of Mitosis ● ● ● ● Prophase Metaphase Anaphase Telophase Prophase ● First and longest phase of mitosis ● Chromatin condenses into chromosomes ● Nuclear envelope breaks down ● Nucleolus disappears Prophase ● Centrioles move to opposite sides of the cell ○ centriole- mass of cytoskeleton that produces spindle fibers during mitosis ● Spindle fibers form ○ strands of microtubules that help separate chromosomes Metaphase ● Chromosomes line up on the cell’s equator ● Spindle fibers attach to the centromeres of the chromosomes Anaphase ● Spindle fibers pull on chromosomes ● Centromere breaks, sister chromatids move to opposite centrioles Telophase ● Chromosomes unwind back into loose chromatin ● Nuclear envelope and nucleolus reform ● Spindle fibers break down Cytokinesis ● Mitosis divides the cell’s nucleus ● Cytokinesis divides the rest of the cell contents ● Occurs during telophase Two Types Of Cytokinesis ● In animal cells, the cell membrane is pinched shut by a ring of actin protein Two Types Of Cytokinesis ● In plant cells, a cell plate forms between the nuclei and becomes a cell membrane ● A cell wall develops in the plate