Meiosis Guided Notes

Meiosis Guided Notes Name: Date: Pd: Using pages 263- 266 in your textbook as well as information previously discussed in class, answer questions 1-30. (42 points) 1. Inside of each of your cells you will find your or DNA. 2. When your cell is going through the division process your DNA will condense to form _ ___. 3. Lined up on your chromosomes are . 4. Genes determine . 5. In the body cells of animals and most plants, chromosomes occur in . 6. Where do the chromosomes in each of our cells come from? BE SPECIFIC! ____ 7. A cell with TWO of each kind of chromosome one from each parent is called and is said to contain a diploid or , number of chromosomes. 8. What do organisms produce that contain only one kind of each chromosome? ____ 9. What is another word for gametes? (NOT IN THE BOOK- THINK!) ____ 10. What are the 2 human gametes? And . 11. A cell with ONE of each kind of chromosome is called and is said to contain a haploid, or , number of chromosomes. 12. Look at table 10.1 on page 265. What is this table showing you? ____ 13. Copy down any 4 rows from table 10.1 in the table below. Organism Body Cell (2n) Gamete (n) 14. TRUE or FALSE. The number of chromosomes a species has is NOT related to how complex that organism is.____ 15. How many body cell chromosomes do humans have? 16. What are homologous chromosomes? 17. Each pair of homologous chromosomes has ?. 18. On homologous chromosomes, genes are arranged in the order. 19. Using figure 10.10 for an example, DRAW a set of 2 homologous chromosomes. 20. When cells divide by MITOSIS the new cells have the __________________ number and kind of chromosome as the ??___________________________ cells. 21. If mitosis were the only way that cells divided, each offspring formed by fertilization of gametes would have _______________ the number of chromosomes as each of its parents. 22. What is MEIOSIS? 23. Meiosis consists of ____________ _________________ divisions. 24. Meiosis I begins with 1 _______________(2n) cell. 25. By the end of Meiosis II there are _____ haploid (______) cells. 26. What kind of haploid cells does meiosis produce? . 27. What is another word for gametes? ______________ _ _________________. 28. What are the two human gametes? _____________________ and ______________________. 29. COPY down figure 10.11 on page 266. Look at the figure and answer the following questions: a. What is the process of egg and sperm coming together called? ________ ____ b. What is a ZYGOTE? ____ c. How does the zygote develop and grow? (HINT: What does it do?) ____ 30. During MEIOSIS spindle fibers form and the cytoplasm divides in the same ways they do in MITOSIS. However, what happens to the in Meiosis is very ___. 31. Draw figure 10.12- ONLY THE BLUE CELLS, not the microscope pictures. COLOR THE CHROMOSOMES and pay attention to the NUMBER OF CHROMOSOMES. Be sure to label the phases. (10 Points) 32. Next to each phase, WRITE 2 BULLET POINTS of events that happen during that phase. Again, it is more important to SEE AND UNDERSTAND what happens in each phase than writing a lot of nonsense. (18 points) 33. Copy down figure 10.13 on page 269. Be sure to label and understand what it is showing you. Then answer the following questions: (Use page 266 and 268 for help if you need it) (6 points) a. What is crossing over? b. When does crossing over occur? c. What is the point of crossing over? Use pages 269-270 to help you answer the following questions. (8 points) 34. Gene combinations in gametes vary depending on how each pair of homologous chromosomes ____ ____. 35. In humans, the number of different kinds of egg or sperm a person can produce is more than ____. 36. When fertilization occurs in humans, different zygotes are possible! 37. Crossing over can occur almost at on a chromosome. This means that an almost endless number of different possible chromosomes can be produced by ____. 38. Why do you think it is important to a species such as humans for crossing over to occur and a large variation of chromosomes be formed? (Hint: Why is genetic variation important?) Total Points: /84