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Meiosis

Meiosis. By Jessica Sheeder Added to by Janet Baity. Meiosis. Is a special type of cell division that happens only in sex cells (reproductive organs) During meiosis the cell goes through two cell divisions Meiosis 1 Meiosis 2. Meiosis 1.

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Meiosis

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  1. Meiosis By Jessica Sheeder Added to by Janet Baity

  2. Meiosis • Is a special type of cell division that happens only in sex cells (reproductive organs) • During meiosis the cell goes through two cell divisions • Meiosis 1 • Meiosis 2

  3. Meiosis 1 • There are the same Five steps that we already learned in Mitosis • 1. Interphase (not part of meiosis or mitosis but part of the cell cycle) • Prophase • Metaphase • Anaphase • Telophase • However, PAIRED chromosomes separate

  4. Meiosis 1-Interphase 1 • The cell continues to grow and prepare for meiosis 1 • DNA is being copied from the parent cell

  5. Meiosis 1-Prophase 1 • In Prophase 1: • Chromosomes condense • Nuclear membrane breaks down • Chromosomes then pair up

  6. Meiosis 1Metaphase 1 • Chromosome pairs line up • Chromosomes arrange as pairs in the middle of the cell • Spindle fibers attach to centromeres of each chromosome

  7. Meiosis 1-Anaphase 1 • Chromatid pairs are torn apart they DO NOT SEPARATE • Single chromosomes move to opposite sides of the cell

  8. Meiosis 1Telophase 1 • Cell divides • No more replication of genetic material • (no more copies of DNA are made before it divides again) • Each has ½ the normal number of chromosomes

  9. Meiosis 2Prophase 2 • The cell prepares to divide again • Each chromosome is made up of two copies (sister chromatids) • This is exactly like mitosis

  10. Meiosis 2-Metaphase 2 • Chromosomes line up in the center of the cell • Spindle fibers attach to the centromeres of the individual chromosomes

  11. Meiosis 2Anaphase 2 • Chromosomes are ripped apart • Once chromosomes are apart they move to opposite sides of the cell

  12. Meiosis 2-Telophase 2 • Cell membrane appears and cells divide • Cytokineses splits the cytoplasm into four new daughter cells

  13. Meiosis-big picture • When going through Meiosis you start out with one cell and end up with 4 new cells that are identical

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