Cell Cycle Review
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Transcript of Cell Cycle Review
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Cell Cycle Review
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What limits cell size?– Not enough DNA– Moving materials into and out of the cell
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What are the parts of the cell cycle?– Interphase (G1, S, G2)– Cell Division (Mitosis & Cytokinesis)
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What are the parts of interphase?– G1 – First Growth Phase (organelles synthesized)– S – Synthesis Phase (chromosomes synthesized)– G2 – Second Growth Phase (organelles for cell
division synthesized)
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What are the 4 parts of mitosis?– Prophase– Metaphase– Anaphase– Telophase
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A.
B.
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The division of the cytoplasm.
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A nuclear envelope re-forms around each cluster of chromosomes.
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The spindle begins to break apart, and a nucleolus becomes visible.
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Chromosomes begins to unwind to form chromatin.
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The centromeres that join the sister chromatids split, allowing the sister chromatids to separate and become individual chromosomes.
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Chromosomes continue to move until they have separated into two groups near the poles of the spindle.
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Chromosome line up in the middle/center of the cell.
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Microtubules connect the centromere of each chromosome to the two poles of the spindle.
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Chromosomes appear.
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Centrioles move to opposite ends of the cell.
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Spindle fibers become attached to the chromosomes at their centromere.
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Nuclear membrane breaks down. Nucleolus disappears.
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Includes G1, S and G2 Phase. Cell Grows and Replicates DNA.
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Replication of DNA
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Normal Cell Growth.
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Final preparation for mitosis.
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Why do our cells divide? – Pass genetic information to new cells– Reproduction– Growth– Replace old cells/dying cells – Replaced damaged or missing cells.