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Meiosis
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What is Meiosis? Meiosis is a process of cell division that creates sex cells (gametes). The sex cells are the ones that combine to form a new organism. Meiosis is a type of copying process that is different than Mitosis.
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How is it different? Mitosis is the process of cell division used by almost ALL cells. It makes an exact copy of the parent cell. Meiosis is a process of cell division used only to create sex cells. It makes a “half-copy” of the parent cell.
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What are the steps of Meiosis
The first stage is duplication. an exact copy of each chromosome is made.
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We now have two homologous chromosomes made up of two chromatids each.
These homologous chromosome pairs line up along the center of the cell.
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Separation of the homologous pairs then occurs…
And the first cytokinesis (separation of the cells) occurs.
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Now each new cell contains one member of each homologous pair.
No more copying occurs, the chromosomes line up at the center of the cell
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The chromatids of each chromosome pull apart (just like in mitosis) and move to opposite sides of the cell. We then have the second cytokinesis (cell division)
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The result is FOUR new cells!
Each cell has HALF the number of chromosomes as the parent cell.
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Why do they have only half?
When you combine the mom’s half cell with the dad’s half cell, you end up with a cell with the correct number of chromosomes for the offspring. + =
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