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What I learned about Mitotis and Meisosis
I learned that Mitotis refers to the division of cells and Meiosis refers to the division of gametes (reproductive cells). Their similarities are they both have cytokinesis (the division of the cytoplasm of a cell following the division of the nucleus) that occurs during telophase (the final stage of Meiosis). Both use spindle fibers to separate the chromatids from each other. Mitosis and Meisosis only occur in eukaryotic cells.
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!
Article posted January 31, 2012 at 12:05 PM •
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