Science 9 Meiosis Internet Lesson

Untitled Document

Answer the following Questions on a sheet of paper

GO TO:

http://www.lew-port.com/10712041113402793/lib/10712041113402793/animations/meiosis.html

1. How many chromosomes does the cell in this animation start with ? __________________
2. The homologous pairs are represented by similar ________________________
3. Copies of chromosomes are held together by the _____________________________
4. Each chromosome finds its __________________________________________
5. Draw "crossing over" - using your pencil to shade in the areas that exchange parts.

6. How many chromosomes are at each pole of the cell? ___________
7. During meiosis 2, chromosomes line up again along the cell's ___________________________
8. Only _________ copy of each chromosome moves toward the poles. Which means only _________ chromosomes of the original six.
9. New membranes form around each ____________________________
10. Each cell divides, forming a total of ______________ cells.

GO TO:

http://www.sumanasinc.com/webcontent/animations/content/meiosis.html

11. Read the introduction. Explain the difference between sexual and asexual reproduction.

Click to Animation

12. DNA replication takes place when? __________________
13. Meiosis consists of two cell divisions: _________________ & __________________
14. Centrosomes (aka centrioles) migrate to _______________________________
15. The pairing of homologous chromosomes is called: ________________________
16. Crossing over points are called __________________
17. What happens in metaphase I ___________________________________________
18. What happens during anaphase I ________________________________________
19. What is interkinesis? ____________________
20. In prophase II, each cells is [ diploid / haploid ] (circle)
21. In metaphase II, chromosomes line up in [ single | double ] file.
22. What happens during telophase II? _______________________________________
23. (Click to Conclusion). Each of the four daughter cells produced by meiosis is [ identical / unique ]

Click to Quiz

24. With respect to meiosis, when does DNA replication occur? ____________________
25. When does crossing over occur? _________________
26. During which phase do chromosomes line up along the equator? __________________
27. During which phase does the nuclear membrane form around the chromosomes? ________

GO TO:

http://www.pbs.org/wgbh/nova/baby/divide.html

Click on the Animation

28. After viewing the animation, fill out the chart below, by placing a check in the box or boxes to indicate which the event occurs in (some events might have checks for both mitosis and meiosis).

	Meiosis	Mitosis
Two cell divisions
Centrioles appear
Chromosomes pair up
Spindle fibers form
Two cell divisions
Cytokinesis
Four daughter cells