Meiosis

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Meiosis

• Unified Science

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Meiosis

• Production of haploid (1n) gametes (sex cells)
  through 2 divisions
• The number of chromosomes is cut in half through
  the separation of homologous chromosomes from a
  diploid cell

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Interphase

• Replication of DNA must occur before cell
  division

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Prophase I

• Chromosomes condense
• Nuclear membrane disappears
• Spindle fibers begin to form
• Homologous chromosomes pair

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Prophase I cont.

• Homologous chromosomes pair to form a tetrad
• Crossing over results in genetic variation

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Metaphase I

• Homologous chromosomes line up along the equator
  of the cell

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Anaphase I

• Homologous chromosomes separate move to opposite
  poles

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Telophase I

• Two cells are formed
• Each has ½ the genetic information of the parent
  cell

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Prophase II

• Condensed chromosomes attach to spindle fibers
• Nuclear membrane disappears

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Metaphase II

• Chromosomes line up along equator of cell

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Anaphase II

• Sister chromatids are pulled apart

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Telophase II

• Each cell forms 2 new (1n) cells

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Meiosis II

• Meiosis II is much like mitosis with chromatids
  separating
• End result of meiosis is 4 cells with half the
  genetic material as the parent cell

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Compare and contrast Meiosis and Mitosis!!!