Name ___________________________________ Meiosis Webquest *Go to: http://www.lpscience.fatcow.com/jwanamaker/animations/meiosis.html 1. Meiosis is used to form _____________ cells (sperm & ___________). 2. Chromosome pairs in the demonstration are represented by _________________________________. 3. How many chromosomes does the cell in this animation start with? ___________ * Click the arrow to progress to the next step of the animation. 4. Chromosomes begin to ________________________, or make copies of themselves. 5. After clicking to the next stage, notice that the chromosomes are doubled and held together in the middle by a ___________________________. 6. The cell is now ready to divide. It still has _______ chromosomes (or ______ pairs). 7. In the next step, the chromosomes find their partner. In each pair, one chromosome came from each _________________________. This cell still has ______ pairs of chromosomes (each represented by a similar ___________________). 8. The chromosomes are now ready to separate from their partners. However, sometimes before they separate, two partners will “_________________________” or trade parts. 9. In the next step, the pairs separate and one chromosome from each pair goes to each ______________. 10. Next a ___________________________ forms at the equator of the cell, creating ___________ cells. There are no longer any ______________ of chromosomes, but each one is still attached to its copy. 11. The chromosomes of each cell now line up along new _______________________ of the new cells. 12. As in _______________________, the doubled chromosomes now separate and move to the new cell’s ____________________. 13. Only ____________ copy of ____________ chromosome from each pair reaches each pole. 14. New _________________________ form around each new nucleus. 15. Each cell is now divided again for a total of ______ new cells. Each cell now has __________ of the original number of chromosomes. * Go to: http://www.sumanasinc.com/webcontent/animations/biology.html *Click on Meiosis. 16. Read the introduction. Explain the difference between sexual and asexual reproduction. *Click on Step-Through 17. DNA replication takes place during which phase of meiosis? _____________________________ 18. Meiosis consists of two cell divisions: ________________________ & _______________________ 19. Centrosomes (aka centrioles) migrate to ____________________________________. 20. The pairing of homologous chromosomes is called _____________________________. 21. Crossing over points are called ___________________________. 22. What happens in metaphase I? _____________________________________________________________________________________ 23. What happens during anaphase I? _____________________________________________________________________________________ 24. What is interkinesis? ________________________________________________________________ 25. In prophase II, each cell is [ diploid / haploid ]. (circle one) 26. In metaphase II, chromosomes line up in [ single / double ] file. 27. What happens during telophase II? _____________________________________________________ * Click to Conclusion 28. Each of the four daughter cells produced by meiosis is [ identical / unique ]. * Click to Quiz 29. With respect to meiosis, when does DNA replication occur? _______________________________ 30. When does crossing over occur? ______________________________ 31. During which phase do chromosomes line up along the equator? ___________________________ 32. During which phase does the nuclear membrane form around the chromosomes? ________________ * Go to: http://www.biologyinmotion.com * Scroll down and click on Cell Division Exercise 33. First click on Practice Mitosis. Draw a simple diagram of what the cell looks like before mitosis begins. Use dark and light versions of the same color to represent homologous pairs of chromosomes. 34. After completing the exercise, draw simple diagrams of the two resulting cells from mitosis. * After completing mitosis, click to go back to start and then click on Practice Meiosis. 35. Draw a diagram of the cell before meiosis. Again, use dark and light versions of the same color to represent homologous pairs of chromosomes. 36. Draw the two cell that are formed after meiosis I. 37. Draw the four cells that are formed after meiosis II.