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Mitosis Web Sites
Mitosis Animations
http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__how_the_cell_cycle_works.html - general
description of the cell cycle.
http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__mitosis_and_cytokinesis.html - description of
interphase, mitosis and cytokinesis
http://highered.mcgraw-hill.com/sites/0073031216/student_view0/exercise13/mitosis_movie.html animation with narration
http://www.csuchico.edu/~jbell/Biol207/animations/mitosis.html - with G1, S, G2 , Mitosis, Cytokinesis
http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__control_of_the_cell_cycle.html
- explains how the cell cycle is controlled
**Scroll down to see actual pictures of onion cells going through the cell cycle.
The onion cells below are in various phases of the cell cycle.
1. The cell in the top row at the far left is in INTERPHASE. Note the dark blue nucleus.
2. The second cell in the top row is in PROPHASE. Note that there is no nuclear membrane & that the chromosomes
(dark blue) are now visible.
3. The third cell in the top row is in METAPHASE.
The chromatids (replicated pairs of chromosomes) have lined up along the equator (aka: metaphase plate) of the
cell. Note the spindle fibers forming the football-shaped structure inside the cell & the dark blue sister chromatids
lined up in the middle of the cell. Spindle fibers/microtubules have attached to the centromere of each chromatid.
4. The fourth cell in the top row is in ANAPHASE.
The 2 sets of chromosomes (dark blue) are moving toward the opposite sides or poles of the cell.
5. The first cell in the second row is in late ANAPHASE.
6. The second cell in the second row is in early TELOPHASE and is also beginning CYTOKINESIS. Note the cell |
plate forming the line in the center of the cell. Chromosomes are still visible & nuclear membrane is reforming
around them. Cell plate is also visible indicating cytokinesis is occurring.
7. The last image shows the 2 daughter cells, each with its own nucleus. If you look closely, you’ll see the nucleolus
inside each nucleus. The cells are now again in G1 of INTERPHASE.
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