Humans have 46 Chromosomes 23 pairs called homologous pairs.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
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).
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| Meiosis | Mitosis |
| Two cell divisions |
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| Centrioles appear |
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| Chromosomes pair up |
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| Spindle fibers form |
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| Two cell divisions |
|
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| Cytokinesis |
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| Four daughter cells |
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