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Name: _________________________ Hour: _____ The Phases of Meiosis -- Internet Lesson In this internet lesson, you will review the steps of meiosis and view video simulations of cell division. Mitosis Tutorial http://www.cellsalive.com/ On the left side of the screen is a navigation bar, click on the link to “MITOSIS” Read the text on this page and view the animation, you can slow down the video by clicking step by step through the phases. 1. List the stages of mitosis 2. During which stage does the following occur: Chromatin condenses into chromosomes _____________________________________________ Chromosomes align in center of cell. _____________________________________________ Longest part of the cell cycle. _____________________________________________ Nuclear envelope breaks down. _____________________________________________ Cell is cleaved into two new daughter cells. _____________________________________________ Daughter chromosomes arrive at the poles. _____________________________________________ Watch the video carefully. 3. The colored chromosomes represent chromatids. There are two of each color because one is an exact duplicate of the other. --How many chromosomes are visible at the beginning of mitosis? -- How many are in each daughter cell at the end of mitosis? The little green T shaped things on the cell are centrioles. -- What happens to the centrioles during mitosis? Meiosis Tutorial http://www.biology.arizona.edu/cell_bio/tutorials/meiosis/main.html See the Contents: You will browse through each topic. Part 1: Reproduction 1. Give an example of asexual reproduction. 2. What is a clone? 3. Name the two types of gametes produced by meiosis. 4. New individuals are formed by a combination of two __________________ cells. (_____________________). 5. What is fertilization? 6. What are the gametes in females? __________________ in males? ____________________. 7. Are the gametes haploid? What does that mean in terms of their chromosome number? 8. What is the new individual called? How many chromosomes sets does the individual have? 9. Summarize the process of meiosis. Part 2: Chromosomes in a Diploid Cell 10. What is the diploid chromosome number for humans? 11. Egg and sperm cells are [ haploid / diploid ] 12. A diploid (2n) of human chromosome consists of ________ chromosomes 13. The haploid (n) number of human chromosomes consists of ______ chromosomes. 14. Autosomes are all the chromosomes except the sex chromosomes. You receive how many autosome chromosomes from each parent? Part 3: Meiosis 1 and Meiosis 2 15. Name the stage of meiosis 1 where each of the following occurs: Homologous chromosomes pair and form synapses _______________________________________ Bivalents align at metaphase plate _______________________________________ Two complete daughter cells form _______________________________________ Nuclear membrane disappears. _______________________________________ Nuclear membrane reforms. _______________________________________ Chromosomes move to separate poles. _______________________________________ View the meiosis 1 and 2 animation 16. At the end of meiosis 2, each cell contains how many chromosomes? Part 4: A Review of Meiosis 17. Name 2 errors that can occur during meiosis. Meiosis Tutorial – Part II http://www.sumanasinc.com/webcontent/anisamples/majorsbiology/ To access the correct page on this site, click on “General Biology” and then on “Meiosis”. 18. Read the introduction. Explain the difference between sexual and asexual reproduction. Now, click on “Animation”… 19. DNA replication takes place when? 20. Meiosis consists of two cell divisions: ______________________ & _______________________ 21. Centrosomes (aka centrioles) migrate to _______________________________. 22. The pairing of homologous chromosomes is called: ________________________. 23. Crossing over points are called __________________. 24. What happens in metaphase I ______________________________________________. 25. What happens during anaphase I __________________________________________. 26. What is interkinesis? 27. In prophase II, each cells is [ diploid / haploid ] (circle) 28. In metaphase II, chromosomes line up in [ single | double ] file. 29. What happens during telophase II? Now, click on “Conclusion”… 30. Each of the four daughter cells produced by meiosis is [ identical / unique ] Now, click on “Quiz”… 31. With respect to meiosis, when does DNA replication occur? 32. When does crossing over occur? 33. During which phase do chromosomes line up along the equator? 34. During which phase does the nuclear membrane form around the chromosomes?
