Mitosis and Meiosis
Use the links below for additional information on mitosis and meiosis.
Mitosis in Animals
1. View a slide of human chromosomes and draw some of the chromosomes in your notebook.
2. Do the chromosomes have one chromatid or two?
Below: Human Chromosomes Click on the photograph to view an enlargement.
The cells of a developing embryo are dividing rapidly and can be used
for viewing the different stages of mitosis. Obtain a whitefish
blastula (early embryo) slide and find a cell in each of these phases:
interphase, prophase, metaphase, anaphase, and telophase.
4. Draw a cell in anaphase.
Below: Whitefish blastula mitosis X 400. Click on the images to view enlargements.
Additional Photographs of mitosis in animals: Ascaris Megalocephala Mitosis
Mitosis in Plants
Cells at the tips of plant roots and stems grow rapidly and can be used
for viewing the stages of mitosis. Used a slide of onion (Allium) root
tip to identify interphase, prophase, metaphase, anaphase, and
6. Find a cell in telophase and draw the cell in your notebook. Draw the cell plate if it is visible.
Below: Allium root tip mitosis X 400. Click on the images to view enlargements.
Meiosis in Animals (Gametogenesis)
7. Obtain a slide of a cross section of rat testes and observe the seminiferous tubules. Identify spermatogonia. Identify sperm.
Below: Rat testes X 100. Click on the image to view an enlargement.
The primary oocyte is contained within a structure called a follicle. As the follicle enlarges, it produces hormones. During ovulation, the follicle ruptures and releases the secondary oocyte.
View a slide of a section of a rabbit ovary under scanning
magnification and observe follicles in various stages of development.
Can you see an oocyte in any of the follicles?
Below: Rabbit ovary X 40. Click on the image to view an enlargement.