Download - Mitosis notes
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Mitosis Notes (pg 4)
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Mitosis Notes
• Mitosis: a body cell divides to form two “daughter cells,” each identical to the parent cell
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Mitosis Notes
• Mitosis: a body cell divides to form two “daughter cells,” each identical to the parent cell
• Necessary for body growth, repair, and maintenance
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Mitosis Notes
• Mitosis: a body cell divides to form two “daughter cells,” each identical to the parent cell
• Necessary for body growth, repair, and maintenance
• Takes place in 6 steps
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1. Interphase
Period between cell divisions. Consists of G1, S, and G2 phases. Cells spend most of their time in interphase. Cell grows, metabolizes, and makes a copy of its DNA. The DNA is in long slender strands (chromatin).
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2. Prophase
DNA condenses into chromosomes, spindle fibers form, nuclear membrane disappears
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3. Metaphase
Chromosomes line up along the center of the cell. Spindle fibers attach to each chromosome.
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4. Anaphase
Spindle fibers shorten, pulling half the chromosomes toward one side of the cell and half toward the other
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5. Telophase
New nuclear membrane forms, spindle fibers disappear, chromosomes start to uncoil
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6. Cytokinesis
• Splits the cell in two
• In animals, the cell membrane is drawn inward until it pinches the cell in two
• In plants, a new cell wall forms in the middle, separating the two cells