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Cell Cycle
Cell Cycle-Well ordered sequence of events between the times a cell divides to form two
daughter cells
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Interphase-the time before mitotic division and cytokenesis
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It is a period of intense biochemical activity during which the cell grows and
makes copies of its chromosomes in preparation for cell division
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S-Synthesis phase when DNA replication takes place
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II
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Mitosis-division of the nucleus
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Cytokenesis via cleavage in animal cells and via a cell plate in plant cells
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Multicellular organisms
1
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Replacement of dead or damaged cells
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Prophase
• Nucleolus dissassociates
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• Mitotic spindle forms
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• Centrosomes move apart, propelled by the lengthening of microtubules between
them
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Prometaphase
• Nuclear membrane disassociates allowing the microtubules to interact with the
chromosomes
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• Each chromatid now has a specialized structure, the kinetochore, located at the
centromere region
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3
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4
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• Kinetochore microtubules shorten at the kinetochore end as chromosomes approach
the poles
• The poles of the cell move farther apart, elongating the cell
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Telophase
• Daughter nuclei begin to form at the two poles
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• Nucleoli reassociates
• Chromatin fiber of each chromosome uncoils and the chromosomes become less
distinct
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Plant cell-cell plate forms at the center of the cell and extends outward eventually
dividing the cell into two daughter cells