Introductory Biology

6.3 Mitosis and Cytokinesis

Centrioles direct where the chromosomes move and the spindle apparatus radiates from microtubules. During mitosis, the microtubule spindle fibers connect to the centromeres and the chromatids are pulled by microtubules. The centrioles are cloned and spindle fibers (hollow tubes of proteins) are gathered. The ends of microtubules are broken down which allow the chromatids to move towards opposite poles.

Mitosis is the nuclear division of cells. Prophase is the first stage in mitosis. It is when the chromosomes in the nuclear membrane condense, the centrioles move to opposite poles, spindle fibers are formed, the nucleolus is broken down and the nuclear membrane disappears. Metaphase is when the chromosomes line up in the center of the cell. *It could be remembered by: at the middle of the mitosis they meet in the middle. Anaphase is when the chromatids move to the opposite poles and this phase continues the entire period the chromatids are moving. The last stage is telophase, which is basically the opposite as prophase. During telophase, the chromatids reach to the opposite poles, nuclear envelope re-appears, nucleolus reforms, spindle apparatus disappears, and the chromosomes de-condense.

Cyntokinesis is the cell division and produces two identical new daughter cells. In animal cells, the cell membrane pinches inward then out with the help of proteins. However in plant cells, a new cell wall is produced from Golgi apparatus vesicles and produce a cell plate resulting with two identical daughter cells.

One thought on “6.3 Mitosis and Cytokinesis

  1. Yurika,

    Good job with your entry for 6.3 on mitosis. Your entry covers all the main ideas clearly.

    Mr. F.

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