Mitosis - Internet Lesson KEY
In this internet lesson, you will review the steps of mitosis and meiosis 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/
On the left side of the screen is a navigation bar, click 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 - prophase |
| Chromosomes align in center of cell. - metaphase |
| Longest part of the cell cycle. - interphase |
| Nuclear envelope breaks down. - prophase |
| Cell is cleaved into two new daughter cells. - telophase (cytokinesis) |
| Daughter chromosomes arrive at the poles - telophase |
| Chromatids are pulled apart - anaphase |
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? _____4_____
--The little green T shaped things on the cell are: ___centrioles________________
-- What happens to the centrioles during mitosis?
__move to the poles_________________
3. Identify the stages of these cells:
metaphase |
telophase |
prophase |
Another Mitosis Animation
Prophase
|
Metaphase
|
Telophase
|
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.
| Interphase | Prophase | Metaphase | Anaphase | Telophase | Total | |
| Number of Cells | 20 | 10 | 3 | 2 | 1 | 36 |
| Percent of Cells (calculate: number of cells divided by total cells x 100) | 56% | 28% | 8% | 6% | 3% | 101%* |
due to rounding of numbers, 101% is the total for percentages
Mitosis in Whitefish & Onion Roots
http://www.biologycorner.com/flash/mitosis.html
For each organism, identify the stage of mitosis.
|
View 1
|
View 2
|
View 3
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View 4
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View 5
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|
| Whitefish | anaphase | metaphase | prophase | telophase | - |
| Onion | anaphase | metaphase | interphase | cytokinesis | telophase |