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Set 1, Slide 57, Lateral Section, Lightfield
Mitosis-Onion Root TipAlthough the sample looks like nothing more that a slice of onion root, examples of all five stages of the mitosis can be found here. Note both the darker, roughly needle-shaped center, and the darker outer edge that does not extend to the most rapidly growing tip of the root.

Here is a little pie chart showing the cell reproduction cycle. The green portion is the long and mostly uninteresting interphase stage, while the pink sections represents the four canonical stages of mitosis: prophase, metaphase, anaphase, and telophase.

Cell Reproduction CycleMitosis Cycle

 

Interphase

During cell reproduction, the cell cycle is basically divided into mitotic and interphase portions. The interphase part is made up of G1, S, and G2 subsections. I don't understand how, but apparently, the cell makes decisions about whether or not it should undergo mitosis while in the interphase stage.

Please note, even though all of these images are take at 1000x magnification (with oil) they each contain so many cells that I decided to deface the photos with red circles and arrows to indicate which particular cell I thought best demonstrated the phase. These marks appear only on the thumbnails, not the larger image.

Also, if these don't appear sufficiently clear, try adjusting your room's lighting, and your monitor's contrast & brightness. I prepared these in a darker room and they are distinct given the proper ambience.

Image Data Description
Interphase
1000x
During interphase, two nucleoli are visible inside of this nucleus.

Prophase

The first stage of mitosis is called prophase. During prophase, the nuclear envelop breaks down and chromatin compacts into disconnected chromosomes. The nucleoli disappears.

Image Data Description
Prophase
1000x
The nucleoli isn't visible at this stage, and there are disconnected chromosomes.

Metaphase

In metaphase, the disconnected chromosomes line up between the poles of the cell.

Image Data Description
Metaphase
1000x
This phase is easiest to spot, all the chromosomes are lined up, but appear in the center of the cell.

Anaphase

During anaphase, aligned chromosomes move to opposite ends of the cell.

Image Data Description
Anaphase
1000x
Anaphse is another obvious phase sporting distinct separation of the chromosomes to the poles of the cell.

Telophase

In telophase, cytokinesis division of the cytoplasmic components occurs. Duplicated chromosomes are captured into new nuclei.

Image Data Description
Telophase
1000x
Here the smallish apparently-two cells appear like mirror images with their nuclei off-center and near to one another. This is a classic telophase arrangement. The chromosomes now appear in the newly minted nuclei.
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