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    An image of a newt lung cell stained with fluorescent dyes undergoing mitosis

    What Is Mitosis?

    CLASS NOTES from Science Prof Online


    Why Do Cells Divide?
    You grew from a zygote (a fertilized egg) into an organism with trillions of specialized cells. Mitosis is the process that enabled you中国福利彩票下载安装αpp to grow and develop after that fateful meeting of egg and sperm became ‘you中国福利彩票下载安装αpp’. That is the human life cycle.

    Article Summary: In order for organisms to grow, develop and maintain life, cells must divide. Cellular division involves the basic stages of interphase, nuclear division (mitosis) and cytokinesis. Here's a summary.
    Mitotic Cell Division of Eukaryotes

    There are two major phases to the cell cycle:
    • Interphase (3 substages)
    • Mitosis (4 substages)

    Cell Replacement
    Cells must divide in order for an organism to grow and develop, but cell division is also required for tissue repair, maintenance, cell turnover and replacement. 
    ​Many tissues in you中国福利彩票下载安装αppr body are composed of cells that have a high turn-over rate. 

    Think of you中国福利彩票下载安装αppr skin. The epidermis, or top layer, is composed of dead cells that are constantly being sloughed off and replaced from below by cells of the dermis (the living cells in the layer of skin below the epidermis). If cells of the dermis were not constantly dividing to replace dead cells, you中国福利彩票下载安装αppr skin would eventually wear out.

    Instructor's Corner
    Continued ... 
    Steps of Mitosis
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