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Cell Division

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Cells can divide in three ways, binary fission, mitosis, and meiosis. Prokaryotes reproduce by binary fission in which the cell basically divides in half. The single, circular DNA, attached to the plasma membrane, duplicates, and the cell begins to grow. Continued growth of the cell separates the chromosomes, and eventually the plasma membrane and cell wall pinch in and create two new cells. Eukaryotes go through a cycle, including interphase and the mitotic phase. Interphase is divided into four stages, G1, S, G2, and M. In G1, cell growth takes place. The organelles get larger and the cell prepares for mitosis. The reproduction of DNA and the replication of chromosomes occur in the S phase, and final preparations for occur in the G2 phase. Actual occurs in M phase (mitosis). Mitosis has four sub-phases, prophase, metaphase, anaphase, and telophase. In prophase, the nucleoli disappears and the chromatin fibers become discrete chromosomes. The mitotic spindle also beings to form and the centrioles begin to move towards opposite ends of the cell. Also occurring later in prophase, the nuclear envelope fragments, and the microtubles attach to the kinetochores and overlap. In Metaphase, the chromosomes line up along the metaphase plate. The centromeres are all aligned and the sister chromatids straddle the metaphase plate. Anaphase beings when ...

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Keywords: cell division definition, cell division phases, cell division mitosis and meiosis, cell division stages, cell division gizmo answer key, cell division pdf, cell division diagram, cell division mitosis

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