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

DNA replication

Pink Insects In New Orleans

These pink Katydids were first written about in 1878

Paris Hilton recently put in an order for hundreds of these litte guys

to be placed in her back yard...she says, "Entomology is hot."

Via Zooilogix

The Amazing Evolution of Whales

It's amazing but whales evolved from something similar to a deer!

This mammals ancestors were once a fish in the ocean

then a land mammal until eventually they returned to the ocean!

Chromosome...Chromatid...Centromere...Kinetochore

All Babies Like A Teddy Bear

A new born baby orphan sifaka was just born in France.

Her name "Tahina" means "to be protected" so she found herself a little teddy bear to cuddle.

Even Hamtsters Eat Their Brocoli And Love It!

Click on the link to watch the video

...he really gets excited halfway through you can tell by his legs.

Happy Valentines from xkcd

Courtesy of xkcd

Blowing Air Bubble Rings

This is an air bubble ring!

This looks like fun...I can't even make an air bubble ring, let alone play with it!

Click on something for the video

Amazing Disappearing Octopus

Octopuses can change the color and texture of their skin and this is the amazing result.

(umm maybe octopi? or octopodes?)



Click on the video link

Learning From Others

Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.

Douglas Adams

Amazing Kaye Effect

I never realized how interesting pouring shampoo could be when you watch it on high speed film!

Click on the link to see it!

Amazing!

Cell Videos

Click on the links below to go to each video you will have to hit the start button a few times to get the animations started.

Animal & Plant Video: A basic click and learn about the cells and their organelles.


Endocytosis & Exocytosis with the cell membrane: A youtube video showing how they work.


Diffusion: An animation with written components and a quiz at the end.


Osmosis: An animation with written components and a quiz at the end.


Active Transport: An Animation with written components and a quiz at the end.

Big and Small

We are looking at interesting animals in different biomes around the world here are two, so...

...What Biomes are these?

This is an ablino pygmy marmoset

This is Shelobs web

Grade 9 Science Computer Lab Day

Go to this website:
http://www.cellsalive.com/cells/cell_model.htm
1. choose animal cell drag your mouse over the image and learn each individual organelles name
2. do the same for the plant cell.

Go to this website:
http://www.cellsalive.com/howbig.htm
1. Watch the demonstration to see how small a cell really is

Go to this website:
http://www.cellsalive.com/puzzles/index.htm
1. Do the puzzle of the animal cell
2. Do the Puzzle of the plant cell

Go to this website:
http://phschool.com/webcodes10/index.cfm?wcprefix=cbe&wcsuffix=3072&fuseaction=home.gotoWebCode&x=13&y=14
1. Click the start button
2. Click on each organelle on the left side and read the description above



You will be quizzed tommorow on the organelles and their function located in the last link.