Review of the Stages of Mitosis

An Interactive Presentationby Kevin Annis

Education 205, section 09 Quit

Mitosis

Interphase

Prophase

Metaphase

Anaphase

Telophase

Cytokinesis

Resources

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Interphase• The cell is in Interphase for most of its life cycle. In Interphase,

the cell “prepares” for division by obtaining nutrients and growing, copying its DNA, and replicating its centrioles. The nuclear membrane is still visible.

• Chromatin has not yet condensed into chromosomes in this stage.

• The nucleolus is still present.

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Prophase• In Prophase, DNA chromatin condense into easily visible chromosomes.

The chromosomes are held together by centromeres. The two strands of chromosome are called sister chromatids.

• The nuclear membrane and nucleolus disappear.• The centrioles move to opposite ends of the cell.

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Click here to view video on Prophase

Metaphase• Spindle fibres from the centrioles attach to the centromeres of the

chromosomes• Chromosomes align at the middle of the cell. This organization

helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive only one copy of each chromosome.

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Click here to view video of Metaphase

Anaphase

• In anaphase, the spindle fibres shorten, which splits the chromosome strand into two separate, sister chromatids. The sister chromatids are pulled to opposite ends of the cell.

• This is the only stage in the life of a cell where the chromosome number is greater than a 2n (or diploid) count.

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Click here to view video of Anaphase

Telophase

• The chromosomes finally reach opposite poles (the ends) of the cell.• The nuclear envelope and nucleolus reform around each new set of

chromosomes. The chromosomes disperse and are no longer visible.

• Spindle fibres disperse and are no longer visible.

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Click here to view video on Telophase

Citokinesis

• Citokinesis marks the end of mitosis in the cell cycle. It is where the cell officially splits into two separate cells, called daughter cells. Each daughter cell now has the same number of chromosomes as the original cell before mitosis. The cell splits when a furrow forms that pinches the cell in two.

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Click on the link below to see video of the overall process of Mitosis

http://www.sp.uconn.edu/~bi107vc/images/anim/mitosis.gif

Video of Prophase

Click the image above to see a histological video of Prophase

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Video of Metaphase

Click the image above to see a histological video of Metaphase

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Video of Anaphase

Click the image above to see a histological video of Anaphase

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Video of Telophase

Click the image above to see a histological video of Telophase

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References

Interphase through Telophase images:

http://library.thinkquest.org/C0118084/Gene/Chromosomal_Inheritance/StagesMitosis.htm

Cytokinesis image:

http://citruscollege.edu/pic/46/c08_08a.jpg

Information obtained from:

http://www.biology.arizona.edu/Cell_bio/tutorials/cell_cycle/cells3.html

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Concept Map

Main Slide:Stages of MitosisInterphaseProphaseMetaphaseAnaphaseTelophaseOverall Mitosis VideoProphase VideoMetaphase VideoAnaphase VideoTelophase VideoResourcesInternet

Main Slide:

Stages of Mitosis

Interphase

Prophase MetaphaseAnaphase

Telophase

Overall Mitosis Video

Prophase Video Metaphase

Video

Anaphase Video

Telophase Video

Resources Internet

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About the Author

Kevin Annis is a junior at Grand Valley State University. He is majoring in biology and is pursuing a minor in chemistry. Currently he is considering getting a second minor in psychology. He plans on teaching biology at the high school level when he completes college. He most enjoys the summer months, where he spends most any free time golfing or fishing.

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Click here to send me an e-mail