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Mitosis and Meiosis

Lecture notes

Use the links below for additional information on mitosis and meiosis.

Mitosis

Meiosis

Mitosis in Animals

Human Chromosomes

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.

human_chromosomes_female_X_1000_1.jpg (13835 bytes)

Whitefish Blastula

3. 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.

whitefish_mitosis_interphase_X_400.jpg (44673 bytes) whitefish_mitosis_prophase_metaphase_anaphaseX400.jpg (83366 bytes) whitefish_mitosis_anaphaseX400.jpg (76435 bytes) whitefish_mitosis_telophaseX400.jpg (81133 bytes)

Additional Photographs of mitosis in animals: Ascaris Megalocephala Mitosis

Mitosis in Plants

5. 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 telophase.

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.

allium_mitosis_prophase_X_400.jpg (53358 bytes) allium_mitosis_prophase_anaphase_X_400.jpg (60487 bytes) allium_mitosis_metaphase_telophase_X_400.jpg (60771 bytes) alliumm_mitosis_interphase_anaphase_telophaseX400.jpg (77511 bytes)

Meiosis in Animals (Gametogenesis)

Testis

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.

Image3.jpg (92736 bytes)

Ovary

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

8. 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.

follicle.jpg (209217 bytes)