LAB 12: MITOSIS

The two chromosomes of the Chromosome 2 pair.

Why are they different colors?
Is this haploid or diploid?

All four chromosomes. None have duplicated yet.

Which stage of the cell cycle does this represent?
How many pairs of chromosomes are here?
Is this haploid or diploid?

The unduplicated Chromosome 1 pair and the Chromosome 2 pair.

What do the inserts (with the magnets) represent?
Which stage of the cell cycle does this represent?

Now each of the four chromosome has duplicated.

Is this haploid or diploid?
How many chromosomes are here?
How many chromatids are here?
Where in the cell does this occur?

Before (top) and after (bottom) duplication of the DNA of the chromosome.

How many sister chromatids in the bottom one?

What is wrong here? Be able to explain why it is wrong.

Is this OK? Explain.

Note: What is wrong with the way the centrioles are shown here?

Which stage of the cell cycle does this represent?
What do the strings represent?

Note the difference in the correct centrioles at top, vs those at the bottom.

Which stage of the cell cycle does this represent?
How many chromosomes are here? (Be careful!)
How many chromatids are here? (Be careful!)

What happens next in a real cell?

To see some photos and/or animations of the onion and whitefish cells in different stages of mitosis, here are some links that are pretty good.

This site from Carolina Biological takes a while to load, but the links in Activity 1 should be helpful.

This one from McGill may need a video download, but the links to microscope slide don't need the download, and they are good ... just like you saw in lab.

This one from Smith has tons of links for all of General Biology, so scroll down and find the topic you want.

Last updated by Steve Muzos September 12, 2002

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