Download Chapter 8 Cell Division

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Chapter 8 Cell Division
Section 8-1 Chromosomes
1. DNA is built of billions of subunits called __________________________.
2. What are chromosomes, & when can they be seen?
3. What is the shape of chromosomes, & what 2 things are they made of?
4. Each chromosome is a single ________________ molecule with ____________________.
5. What is the purpose of nonhistone proteins?
6. Chromosomes consist of two identical _____________________ called _________________.
7. Chromatids _______________________ during cell division so the two new cells will each
receive _________________ chromatid.
8. How does DNA appear in a cell between cell divisions?
9. How many chromosomes do prokaryotes have?
10. Give 2 functions of the sex chromosomes.
11. Name the 2 sex chromosomes & tell what combination determines a male and a female organism.
12. What are autosomes & how many autosomes are in human cells?
13. What are homologous chromosomes & how do they compare to each other?
14. What is the main difference between diploid & haploid cells?
15. What type of cells in human would be diploid? Haploid?
16. When a haploid (1n) ______________________ cell combines with a haploid
_______________________ cell, the new cell will be ______________________ or
____________________________.
Section 8-2 Cell Division
17. All cells are derived from ___________________________________.
18. How do the two new cells compare to each other after binary fission? How do they compare to the
original cell?
19. What two main cellular parts must be divided in eukaryotic cell division?
20. Name the 2 types of cell division in eukaryotes.
21. What type of cell uses mitosis?
22. What effect does meiosis have on the chromosome number of a cell?
23. How do the cells produced by meiosis reestablish a complete set of chromosomes?
24. What is the time between divisions in the life of a cell called?
25. How many phases is interphase divided into? Cell division?
26. Name the 2 parts of cell division.
27. What happens to the cell in each of these two parts of cell division?
28. In what stage do cells spend most of their time?
29. What is the size of cells immediately following cell division?
30. Name the 1st stage of interphase & tell what happens to the cell.
31. What stage of interphase do cells enter once they become mature?
32. What happens to a cell during the S phase of interphase?
33. What is the last stage of interphase called & what is happening to the cell?
34. What is the Go phase and what type of human cells are in this phase?
35. Name the 4 stages of mitosis in order.
36. What cellular part actually divides during mitosis?
37. Describe everything that happens to a cell during prophase.
38. What are centrosomes & when do they appear?
39. What type of cell has centrosomes?
40. What is found inside centrosomes?
41. Are centrioles found in both plant & animal cells? Explain.
42. What forms from centrioles & what is their function?
43. Name the 2 types of fibers that make up the mitotic spindle & describe each one.
44. Describe everything that happens to a cell during metaphase.
45. Describe everything that happens to a cell during anaphase.
46. Describe everything that happens to a cell during telophase.
47. Mitosis is division of the _______________________, while ________________________
is the division of the cytoplasm.
48. Describe how cytokinesis occurs in animal cells (figure 8-7, page 151)
49. The ____________________ pinches a dividing animal cell into two new cells by the action
of ______________________________.
50. How does the cell plate from during cytokinesis of a plant cell?
51. How do the new cells formed after mitosis & cytokinesis compare in size & chromosome number to
each other and the original cell that divided?
52. The original cell that divides is called the _______________________ cell, while the
two new cells are called ____________________ cells.
Section 8-3 Meiosis
53. What type of cell undergoes meiosis?
54. Meiosis produces ___________________ reproductive cells called ____________________.
55. Name the 2 human gametes & tell their chromosome number.
56. What is the chromosome number for humans?
57. The fusion of a _________________ and an _____________ produces a
________________ with 46 (2n) chromosome number.
58. Cells starting mitosis & meiosis begin with a ____________________ set of chromosomes.
59. How many times do cells divide during meiosis?
60. What are the stages of meiosis called?
61. What is synapsis & when does it occur?
62. What is a tetrad?
63. How are genes aligned on homologous chromosomes?
64. Explain what happens during crossing-over?
65. What type of material is exchanged during crossing-over?
66. Crossing over results in genetic _______________________________.
67. What is independent assortment & what result does it produce?
68. Name 2 things that occur during telophase I.
69. How many cells are formed at the end of Meiosis I & how many copies of chromosomes does each cell
have?
70. Is DNA copied before Meiosis II?
71. How many cells form at the end of Meiosis II and how many chromosomes do they contain?
72. In humans, meiosis occurs in the ___________________ and in the __________________
producing cells called ________________________.
73. Define spermatogenesis & tell where it occurs.
74. What are spermatids & how many form from meiosis?
75. Define oogenesis & tell where it occurs.
76. Mature egg cells are called ___________________.
77. Explain how only one egg cell is formed instead of four from meiosis.
78. 106. What are the 3 other products of meiosis called?
79. Name 2 types of asexual reproduction.
80. Name a type of asexual reproduction in unicellular organisms.
81. How do the offspring of asexual reproduction compare to their parents?
82. How do offspring from sexual reproduction compare to their parents?
83. Is there ever a case in sexual reproduction where offspring can be genetically alike? Explain.
84. What is the evolutionary advantage of sexual reproduction?