Why Onions?
Mitosis
Onions have larger chromosomes than most
plants and they stain dark.
The chromosomes are easily observed
through a compound light microscope.
The apical meristem is an area of a plant
where cell division takes place at a rapid rate.
Stages of Mitosis
The numbers to the left correspond to the numbered pictures on the right. For example
picture 1 is a cell in interphase.
1 interphase
2 Beginning of prophase
3 early prophase
4 mid prophase
5 late prophase
6 metaphase
7 early anaphase
8 anaphase
9 telophase
10 cytokinesis
Interphase
The highlighted area shows a cell in
interphase. Draw this cell in the
space provided.
-The cell is growing in size
- The cell is replicating its
DNA in preparation for
division.
-The nucleus is apparent.
Prophase
The highlighted area shows a cell
in prophase. Draw this cell in
the space provided.
-the nuclear envelope
starts to break down
-all the chromosomes
start to coil up in the
center of the cell.
-nucleoli disappear
Metaphase
The highlighted area shows a cell
in metaphase. Draw this cell in
the space provided.
-the chromosome pairs
line up in the center of
the cell along spindle
fibers that pull to
either side of the cell.
Anaphase
The highlighted area shows a cell in
anaphase. Draw this cell in the space
provided.
• The spindle fibers become
shorter and pull each
chromosome pair apart to
the opposite ends of the
cell.
Telophase
The highlighted area shows a
cell in telophase. Draw this
cell in the space provided.
• The final stage of cell
replication.
• The nuclear envelope
and nucleoli are
reformed.
Cytokinesis
• Cell wall begins to
form
• Two daughter cells
are formed
Mitosis in Plant Cells
Mitosis in Animal Cells
White Fish (Magnification 400)
Mitosis in Animal Cells
White Fish
Prophase
Mitosis Animal Cells
Metaphase
Mitosis Animal Cells
Anaphase
Mitosis Animal Cells
Telophase
Mitosis in Animal Cells
Cytokinesis
Mitosis in Animal Cells
White Fish
Resources
•
http://www.microscopy-uk.org.uk/mag/artnov04macro/jronionroot.html
•
http://www.vcbio.science.ru.nl/en/image-gallery/show/PL0096/labels/
•
http://biog-101104.bio.cornell.edu/BioG101_104/tutorials/cell_division/onion_review_fs.ht
ml
White Fish Cell Mitosis Pictures: http://www.linkpublishing.com/videomitosis.htm#MITOSIS_-_WHITEFISH_BLASTULA
White Fish Mitosis Cells Pic:
http://www.flickr.com/photos/10517539@N07/1554957435/
Mitosis World:
http://www.bio.unc.edu/faculty/salmon/lab/mitosis/mitosislinks.html
www.cellsalive.com
•
•
•
•