Meiosis Internet Tutorial KEY

In this internet lesson, you will review the steps of meiosis and view video simulations of this type 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.

Meiosis Tutorial

go to: http://www.biology.arizona.edu/cell_bio/tutorials/meiosis/main.html

Part 1: Reproduction

1. Give an example of asexual reproduction. a new plant grows out of the root or a shoot from an existing plant.

2. What is a clone?  exact copy of the original organism

3. (Click the next button) What is the difference between haploid and diploid?
haploid has one set of chromosomes, diploid has two

Part 2: Chromosomes in a Diploid Cell

4. What is the diploid chromosome number for humans? 46

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 _________prophase I___
Bivalents align at metaphase plate ________metaphase I____
Two complete daughter cells form _______telophase I_______
Nuclear membrane disappears. _______prophase I_______
Nuclear membrane reforms. _______telophase II__
Chromosomes move to separate poles. ______anaphase I_____

View the meiosis 1 and 2 animation

12. At the end of meiosis 2, each cell contains how many chromosomes? (click the “next” button) 2

Part 4: A Review of Meiosis

13. Name 2 errors that can occur during meiosis. nondisjunction & translocation

Test Yourself - Try some of the problem sets on the test yourself pages.

Check out http://www.cellsalive.com/meiosis.htm

14. Label these phases

______metaphase I__

_______anaphase I____________