Meosis Comic

Meosis Comic

Storyboard Text

  • Today we are going to learn about meiosis!
  • Meiosis is used for the production of gametes.
  • when does meiosis occur?
  • You can see the purpose of meiosis on the board. Gametes are sex cells such as sperm or egg cells. Meiosis creates variation!
  • Great question Tommy!
  • Meiosis occurs after interphase. See diagram ------->
  • The cell goes through all of the same processes as mitosis. The cell grows, replicates the DNA, grows again and preps for division. But instead of making 2 daughter cells, meiosis makes 4 sex cells.
  • Then what happens?
  • Meiosis has two divisions, meiosis I (PMAT 1) and Meiosis II (PMAT 2)
  • Prophase 1 is the first step, where homologous chromosomes join together. From there they exchange genetic information. This is called crossing over.
  • I was just getting to that Abigail...
  • But how do we get 4 cells?
  • Metaphase, Anaphase, Telophase, and then Cytokinesis occur after Prophase
  • As in mitosis, the cell's chromosomes line up in the middle and the spindle fibers attach to the center of them (metaphase). Then the chromosomes are pulled to opposite ends of the cell by the spindle fibers (anaphase).
  • Then two new cells begin to form and the nucleus reappears around both sets of DNA (telophase). Then cytokinesis, the division of the cytoplasm, occurs.
  • REPEAT!!!!
  • Well Jamie, Remember when we talked about the two divisions? The second division makes the 4 cells! The same process in PMAT 1 occurs again to get 4 genetically different gametes.
  • Class dismissed!
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