Name ____________________________
Mitosis
and Meiosis -- Internet Lesson
| 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. |
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. List the stages of mitosis
2. 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. | _____________________________________________ |
Watch the
video carefully.
3. 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 centrioles.
-- What happens to the centrioles during mitosis?
http://www.biology.arizona.edu/cell_bio/tutorials/meiosis/main.html
See the Contents: You will browse through each topic.
| Part 1: Reproduction |
1. Give an
example of asexual reproduction.
2. What is a clone?
3. Name the two types of gametes produced by meiosis.
(click the “next button”)
| Part 2: Chromosomes in a Diploid Cell |
4. What is
the diploid chromosome number for humans?
5. Egg and sperm cells are [ haploid / diploid ]
(click the “next” button)
| Part 3: Meiosis 1 and Meiosis 2 |
6. Name the
stage of meiosis 1 where each of the following occurs:
| Homologous chromosomes pair and form synapses | _______________________________________ |
| Bivalents align at metaphase plate | _______________________________________ |
| Two complete daughter cells form | _______________________________________ |
| Nuclear membrane disappears. | _______________________________________ |
| Nuclear membrane reforms. | _______________________________________ |
| Chromosomes move to separate poles. | _______________________________________ |
|
View the meiosis 1 and 2 animation |
12. At the end of meiosis 2, each cell contains how many chromosomes?
(click the “next” button)
| Part 4: A Review of Meiosis |
13. Name 2 errors that can occur during meiosis.
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
|
36 | |||||
|
Percent of cells (calculate: number of cells divided by total cells x 100 ) |
100 % |
Did you forget a calculator -- no problem. Go to www.calculator.com and
click on the “fractions” calculator. A window with a virtual calculator
will open and you can do the math from there.