Illustrated here are micrographs showing the stages that can be
observed during the process of mitosis. These micrographs are of
whitefish blastula cells.
All of these cells are between divisions. The nuclei are
seen with their membranes present. Chromosomes are extended
and not visible.
Since we see chromosomes (they are replicated)
appearing as units in the area where the nucleus was located
and the nuclear membrane is no longer present, the cell
marked "P"shows the signs of this first stage of
The spindle (S) is complete and the
chromosomes are lined up at the equator. Cell
"M" is in metaphase.
The replicated chromosomes are moving away from
each other towards the poles, a clear indication that
cell "A" is in anaphase.
We are rarely able to observe telophase. Cell "T" shows the replicated chromosomes clearly at the poles and the spindle fibers being cut through by the formation of the furrow and cell membrane. Mitosis will be complete when two cells are fully formed.
This is another view of telophase with the spindle a
little less clear and a completed membrane. When the nucleus
has its membrane, the nucleolus is reformed and the
chromosomes have unwound, mitosis will be complete.
All micrographs are the property of Sherri Wick. Students of Biology 2740 and 2840 are welcome to use this page in the study and review of lecture and lab materials in the Human Physiology and Anatomy courses.
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