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13 Cards in this Set
- Front
- Back
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Reasons for cell division
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Growth, Repair, and Reproduction
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The Cell Cycle
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A series of events from one cell division to the next.
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Length of Cell Cycle
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Varies for different types of cells.
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Mitosis
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The process by which the nucleus divides to form two identical nuclei.
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Chromosome
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A structure in the nucleus that contains hereditary material.
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Steps of Mitosis
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Interphase, Prophase, Metaphase, Anaphase
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Interphase
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Chromosomes duplicate, nucleus is ready to divide, chromosomes thicken and coil into identical strands called chromatids. Most of a eukaryotic cell's life is spent in this phase.
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Prophase
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The nucleolus and nuclear membrane disintergrate, centrioles move to opposite ends of cell, spindle fibers stretch
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Metaphase
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the pairs of chromatids line up in middle, the centromere attaches to spindle fiber-one from each side of cell
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Anaphase
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centromere divides, spindles shorten, each pair of chromatids separate and begin to move to opposite ends of cell. They are now chromosomes.
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Telophase |
Spindle fibers start to disappear, chromosomes start to uncoil and two new nuclei form |
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Cell division |
following mitosis the cell divides-animal cells pinch in the middle and divide-plant cells form a cell plate where the cells divide |
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Results of mitosis and cell division |
Mitosis is division of nucleus, two new nuclei are created. They are identical to each other and the original nucleus. Each has the same number of chromosomes. The original cell no longer exists. Cell division allows growth and replaces worn out cells. New organisms can be produced. |
