Mitosis - Internet Lesson

In this internet lesson, you will review the steps of mitosis and view video simulations of cell division. You will also view an onion root tip and calculate the percentage of cells at each of the stages of cell division .

Mitosis Tutorial at http://www.cellsalive.com/

Cllick on the link to “MITOSIS” Read the text on this page and view the animation, you can slow down the video by clicking step by step through the phases.

1. Which stage does the following occur:

Chromatin condenses into chromosomes
Chromosomes align in center of cell.
Longest part of the cell cycle.
Nuclear envelope breaks down.
Cell is cleaved into two new daughter cells.
Daughter chromosomes arrive at the poles.
Chromatids are pulled apart

Watch the video carefully.

2. The colored chromosomes represent chromatids. There are two of each color because one is an exact duplicate of the other.

-- How many chromosomes are visible at the beginning of mitosis? ________________

-- How many are in each daughter cell at the end of mitosis? __________________

--The little green T shaped things on the cell are: ____________________________

-- What happens to the centrioles during mitosis? _____________________________

3. Identify the stages of these cells and label the structures shown.

             

Onion Root Tip

Online Activity at http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/cell_cycle.html

Read the introduction, then click the “next” button.

You will have 36 cells to classify. When you’re finished, record your data in the chart below. Round to whole numbers.

	Interphase	Prophase	Metaphase	Anaphase	Telophase	Total
Number of Cells
Percent of Cells (calculate: number of cells divided by total cells x 100)

Based on your data, cells spend most of their time in which phase?

Mitosis in Whitefish & Onion Roots

http://www.biologycorner.com/projects/mitosis.html .

Click on the Whitefish embryo and the onion root tip.

For each view, identify the stage of mitosis.

	View 1	View 2	View 3	View 4	View 5
Whitefish
Onion

What are the similarities between the two types of cells (onion and whitefish)?

 

What are the differences?

 

You Draw It!

Use the space below to draw the four stages of mitosis your own way, be sure to represent the major events of each phase and label structures.

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Other Mitosis Resources

Mitosis in an Onion - view picture, identify the stages of mitosis in each of the cells

Cell Cycle Label - label a picture of the stages of mitosis, identify parts of the cell such as the centriole and spindle

Onion Root Tip Lab - view real cells with a microscope, requires lab equipment and prepared slides

Cancer: Out of Control Cells - article describing how the cell cycle relates to cancer, includes questions