SCCS AP Biology Name:Mitosis: Onion Root TipInternet Lab Activity

Go to our class website http://www.mrsbrennersbiology.com/ap-biology.htmlScroll down to today’s date (12-1) and click on “Website 1”.

Read the “Introduction to the Lab”.

1. Define “mitosis”:

2. Why are root tip cells good for the purpose of studying the process of mitosis?

Click on “Begin Assignment”

Part 1.

a. Click on the root tip to magnify the image.

b.What differences can you see when you compare the nucleus of a dividing cell with that of a non-dividing cell?

Part 2.

Click on the class website again and click on “Website 2”. Watch the video of mitosis in an animal cell.

Go back to the Onion Root Tip website. Click on “Part 3”.

Part 3.

Cut and paste a screen shot of a cell in each of the stages of mitosis: Prophase, Metaphase, Anaphase, and Telophase. (You should have 4 screen shots, each labeled by the stage of mitosis that the cell is in). Use the Picture Tools to get a magnified view each cell that you identify.

Example:

Metaphase

When you have finished cutting, pasting, magnifying, and labeling your 4 screenshots, click on “Mitosis in an Animal Cell”.

Click on “Click to begin”.

Click on the group of slides of whitefish blastulae (embryonic cells).

Click on any of the slides to magnify it. Use the scroll bars to move around,

Cut and paste a screen shot of a cell in each of the stages of mitosis: Prophase, Metaphase, Anaphase, and Telophase. (You should have 4 screen shots, each labeled by the stage of mitosis that the cell is in). Use the Picture Tools to get a magnified view each cell that you identify.

Example:

Telophase/cytokinesis

Post-Activity Questions:

1. Which cells (plant or animal) show the most regularity in the direction in which they divide? Give an explanation for this difference.

2. What evidence of cytokinesis is visible in telophase in the onion root cells?

3. What evidence of cytokinesis is visible in telophase in the whitefish cells?

4. In what phase of the cell cycle do cells spend most of their life? What evidence of this do you see in the slides?