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Meiosis

Meiosis. The Basics. 2 Divisions of the nucleus 2 parts= Meiosis I and Meiosis II Creates 4 haploid cells. Mitosis 1 division of the nucleus Makes Diploid Cells Begins with Interphase when DNA is copied Used to reproduce cells in general. Meiosis 2 divisions of the nucleus

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Meiosis

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  1. Meiosis

  2. TheBasics • 2 Divisions of the nucleus • 2 parts= Meiosis I and Meiosis II • Creates 4 haploid cells

  3. Mitosis 1 division of the nucleus Makes Diploid Cells Begins with Interphase when DNA is copied Used to reproduce cells in general Meiosis 2 divisions of the nucleus Makes Haploid cells Begins with Interphase when DNA is copied Used to produce sex cells for sexual reproduction Mitosis vs. Meiosis

  4. Mitosis centrioles duplicate and begin to move to opposite side of the cell chromatids are winding up nuclear membrane breaks down Meiosis I centrioles duplicate and begin to move to opposite side of the cell chromatids are winding up nuclear membrane breaks down chromosomes group with their homologous pairs Mitosis vs. Meiosis I: Prophase

  5. Mitosis chromosomes line up in center of cell centrioles send out spindle fibers that attach to the centromeres Meiosis I homologous pairs line up along the center of the cell spindle fibers from opposite poles attach to the centromere of one chromosome of the homologous pair Mitosis vs. Meiosis I: Metaphase

  6. Mitosis spindle fibers begin to pull chromatids (homologous pairs) apart Meiosis I homologous pairs are pulled apart and taken to opposite sides of the cell Mitosis vs. Meiosis I: Anaphase

  7. Mitosis cell begins to separate only nucleus has been duplicated so far cytoplasm and other organelles begin their duplication Meiosis I two haploid cells are formed but each chromosome still has two chromatids (it’s duplicated) Mitosis vs. Meiosis I: Telophase

  8. Meiosis II: Prophase II • wound up chromosomes can still be seen 3. a new nuclear membrane was not formed previously so it does not disintegrate now 2.centrioles begin to move to opposite sides again

  9. Meiosis II: Metaphase II 1.The duplicated chromosomes line up along the center of the cell again 2. spindle fibers attach to centromeres again

  10. Meiosis II: Anaphase II • sister chromatids separate and move toward opposite sides of the cell

  11. Meiosis II: Telophase II • two new nuclei begin to form and two new haploid cells are created • 4 haploid cells are created all together

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