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 What I learned about Mitotis and Meisosis How do cells divide? The 6,000 million letters of DNA code in your cells are coiled up as 46 bundles- chromosone. Before a cell can divide, it must unravel it's chromosone and copy all it's DNA, so that each new cell will het a complete copy. The seven stages of Mitosis- 1. Interphase- this is the longest period of the cell splitting cycle. DNA replicates, the centrioles divide and protiens produced. 2. Prophase- During this stage the nucleus fades and chromatin turns into chromosomes. Each replicated chromosomes sacrifices two chromatids. Microtubules of cytoskeleton disassemble. 3. Pro-metaphase-the nucleus goes away and some of of the mitotic spindle fibers elongate. 4. Metaphase- Tension from the spindle fibers align the chromosomes to one plane at the cells center. 5. Anaphase- Spindle fibers shorten the kinetochores separate and the chromatids are pulled apart and begin moving. 6. Telophase- The "daughter" chromosomes arrive at the poles and the spindle fibers dissapear. 7. Cytokinesis- The spindle fibers not attached to the chromosomes begin breaking down until only some overlap is left. It is in this overlap that a ring cleaves the cell into two daughter cells. Microtubules then reorganize into a new cell shape so now the cell can make a new Mitosis cycle. Here's a video of Meiosis! http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=aaNnGs7MmUY Article posted January 31, 2012 at 12:05 PM • comment • Reads 759 • see all articles |
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