The cell cycle web worksheet



Name: ___________________

The cell cycle web worksheet

You were introduced to some of the parts of the cell cycle in lecture yesterday. Now it is time to see what happens when onion root tips are looked at in a version of a lab we may be utilizing this unit in the classroom. Follow all directions and answer each question thoroughly. This lab is a great visual representation of the time spent in each of the parts of the M phase in the cell cycle.

Put the following address in the web browser:

(Read this first page and click on “next” near the bottom of the screen

(Using this page of the website, you need to write the five different parts of the cell cycle that will be seen in this activity and give some defining characteristics of each stage.

First stage:

Characteristics:

Second stage:

Characteristics:

Third stage:

Characteristics:

Fourth stage:

Characteristics:

Fifth stage:

Characteristics:

(Click on the “next” at the bottom of the screen

(Read this page and make sure you use the table on this next page to tally your results.

(Click on the “next” button. This will take you to the online lab portion of this activity. When a cell is shown, use the notes you took above and decide what stage of the cell cycle that cell is in. After you have decided, click on that stage—if you are right, it will say correct and will show you another cell. If you are incorrect, it will tell you a feature that will aid in your next guess (make sure you click the “try again” button and it will let you make another guess).

|Interphase |Prophase |Metaphase |Anaphase |Telophase |Total | |Number of cells | | | | | |36 | |Percent of cells | | | | | |100% | |

(After you are all done, the final page will show you how many cells are in each stage. Read the short paragraph and transfer the data to the graph above. To figure out the percent of cells row, take the number of cells in that phase and divide it by the total number of cells (36). Repeat this for each of the remaining stages.

ANSWER THE FOLLOWING QUESTIONS:

1. According to your data, how many hours does a cell spend in interphase? Use a 24-hour day for this calculation.

2. Calculate the time spent in each of the other phases during a 24-hour day.

3. Draw a cell in prophase, metaphase, anaphase, and telophase.

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