Mitosis
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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

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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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http://www.johnkyrk.com/mitosis.html

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http://www.youtube.com/watch?v=iHF422aDh1o&feature=related


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