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Mitosis. Melissa Gustray , Mickey Gill, Justin Girone. Mitosis & Meiosis. Mitosis is a form of cell division that occurs in somatic (non-sex) cells and produces two daughter cells from an original cell New cells are genetically identical 46 chromosomes

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mitosis

Mitosis

Melissa Gustray, Mickey Gill, Justin Girone

mitosis meiosis
Mitosis & Meiosis
  • Mitosis is a form of cell division that occurs in somatic (non-sex) cells and produces two daughter cells from an original cell
    • New cells are genetically identical
    • 46 chromosomes
  • Meiosis is a second form of cell division that occurs only in the cells that give rise to sex cells (sperm and eggs)
    • Halves chromosome number
    • Does this so that when the sperm fertilizes the egg, the 46 chromosomes are restored
interphase
Interphase
  • First step in cell division.
  • Cells replicate genetic information and all organelles.
  • Divided into phases:
    • S Phase- synthesis
      • Cellular components duplicate
    • G Phase- gap or growth
      • G1 and G2- specific molecules and structures duplicate (everything but DNA) & cellular growth occurs
mitosis1
Mitosis
  • Karyokinesis- “nucleus movement”, nuclear contents divide
  • Cytokinesis- “cell movement”, cytoplasm is equally divided between the two new daughter cells
  • Continuous cycle broken down into four stages:
    • Prophase
    • Metaphase
    • Anaphase
    • Telophase
prophase
Prophase
  • First stage of mitosis
  • Chromatin condenses into chromosomes
  • Centrioles move to opposite sides of cytoplasm
  • Nuclear membrane and nucleolus disperse
  • Microtubules assemble and associate with centrioles and chromatids of chromosomes
metaphase
Metaphase
  • Second stage of mitosis
  • Spindle fibers from the centrioles attach to the centromeres of each chromosome
  • Chromomsomes align midway between the centrioles
anaphase
Anaphase
  • Third stage of mitosis
  • Centromeres separate, and chromatids of the chromosomes separate
  • Spindle fibers shorten and pull these new individual chromosomes toward centrioles
telophase
Telophase
  • Final stage of mitosis
  • Chromosomes elongate and form chromatin threads
  • Nuclear membranes form around each chromosome set
  • Nucleoli form and microtubules break down
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