Unit A Reproduction

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Use What You’ve Learned 15. An organism is composed of 280 cells. If each cell divides, how many cells would be present after eight divisions? 16. The following cells all divide faster than other average cells. Explain why. (a) the roots of a pine seedling (b) a tadpole developing into a frog (c) human cheek cells (d) white blood cells in the blood of a person with chicken pox 17. Use the circle graph in Figure 5 to answer the following questions. Figure 5 interphase prophase metaphase anaphase telophase (a) In which stage does growth occur? (b) In which stage do double-stranded chromosomes become single-stranded chromosomes? (c) During which stages is the cell undergoing cell division? (d) When does the genetic material get replicated? (e) During which stage would cytokinesis begin? (f) During which stage would the cell plate begin to form? 18. (a) If a parent cell has 12 chromosomes, how many chromosomes will each daughter cell have following mitosis? (b) Predict a possible outcome for each daughter cell if all the chromosomes moved to only one pole of the cell during anaphase. 19. Explain how a plant nursery could make use of one type of asexual reproduction. 20. Compare RNA and DNA molecules in terms of their structure, function, and location. 21. Explain how genes can cause a range of eye colours. Think Critically 22. Your body does not have all the cells you had when you were a baby. What has happened to those cells? 23. Describe several ways in which industries could use information on the rate of cell division in certain organisms. 24. Certain herbicides (chemicals that kill plants) make plant cells divide faster than normal for a species. Why would these herbicides kill weeds? (Hint: Think about what cells are doing when they are not dividing.) 25. Why do some pesticides cause cancer? Reflect on Your Learning 26. Cloning of mammals is a scientific and technological achievement, but it raises many concerns. Did the discussion of reproductive cloning of mammals change your opinion about the pros and cons of using this technology? Explain why or why not. 27. The stages of mitosis are named so they can be more easily discussed. Cells do not stop between stages. What observations did you make in your investigations to suggest that mitosis is a continuous process? Visit the Quiz Centre at www.science.nelson.com GO NEL Chapter 2 Review 71
CHAPTER 3 Sexual <strong>Reproduction</strong> KEY IDEAS Meiosis is the process that produces sex cells. Sexual reproduction involves the joining of genetic material from two parents. Sexual reproduction creates the incredible diversity among members of the same species. There are advantages and disadvantages to both asexual and sexual reproduction. Organisms use a variety of strategies to ensure the success of sexual reproduction. Scientists have used their knowledge of sexual and asexual reproduction to develop reproductive technologies. 72 NEL
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Page 3 and 4: CHAPTER 2 Cell Growth and Reproduct
Page 5 and 6: 2.1 The Importance of Cell Division
Page 7 and 8: 2.1 CHECK YOUR Understanding 1. Giv
Page 9 and 10: Figure 2 Plant cell structures cyto
Page 11 and 12: 2.3 From DNA to Proteins You have l
Page 13 and 14: Did You KNOW? The Human Genome The
Page 15 and 16: LEARNING TIP Think about the sectio
Page 17 and 18: USING MITOCHONDRIAL DNA TO SOLVE MY
Page 19 and 20: centrioles nucleus chromosome spind
Page 21 and 22: 2.4 CHECK YOUR Understanding 1. Wha
Page 23 and 24: LEARNING TIP Make connections to yo
Page 27 and 28: Binary fission allows for rapid pop
Page 29 and 30: 2.6 CHECK YOUR Understanding 1. At
Page 31 and 32: could clone frogs, they were unable
Page 33 and 34: 2A Investigation Observing Cell Div
Page 35 and 36: 2B Investigation Determining the Ra
Page 37 and 38: CHAPTER 2 Review Cell Growth and Re
Page 39: Review Key Ideas and Vocabulary 1.
Page 43 and 44: 3.1 Meiosis LEARNING TIP Scan the t
Page 45 and 46: Interphase Prophase Metaphase Anaph
Page 47 and 48: 3.1 CHECK YOUR Understanding 1. How
Page 49 and 50: allele for straight hairline homolo
Page 53 and 54: If you would like to learn more abo
Page 55 and 56: Figure 5 Male and female cones are
Page 57 and 58: 3.4 Development of the Zygote 3B In
Page 59 and 60: Eggs The vast majority of animals l
Page 61 and 62: 3.4 CHECK YOUR Understanding 1. Nam
Page 63 and 64: LEARNING TIP Photographs play an im
Page 65 and 66: TRY THIS: A Model of Recombinant DN
Page 67 and 68: 3A Investigation Examining Flowers
Page 69 and 70: 3B Investigation Examining Seeds Re
Page 71 and 72: CHAPTER 3 Review Sexual Reproductio
Page 73 and 74: Review Key Ideas and Vocabulary 1.
Page 75 and 76: CHAPTER 4 Human Reproduction KEY ID
Page 77 and 78: 4.1 The Male Reproductive System LE
Page 79 and 80: LEARNING TIP Did you notice that Se
Page 81 and 82: 4.2 The Female Reproductive System
Page 83 and 84: Depending on whether the egg is fer
Page 85 and 86: 4.2 CHECK YOUR Understanding 1. Lis
Page 87 and 88: amniotic fluid placenta umbilical c
Page 89 and 90: Figure 7 The zygote has divided sev
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CORD BLOOD: BIOLOGICAL INSURANCE Sc
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Figure 2 The X chromosome (a) is fa
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4.4 CHECK YOUR Understanding 1. Wha
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Figure 2 The karyotype of Down synd
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4.6 Prenatal Procedures (a) (b) Fig
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4.6 CHECK YOUR Understanding 1. Nam
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4.7 Reproductive Technologies LEARN
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4.7 CHECK YOUR Understanding 1. At
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Sample Stakeholder Perspectives •
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CHAPTER 4 Review Human Reproduction
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Review Key Ideas and Vocabulary 1.
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UNIT A Review Reproduction Unit Sum
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15. Complete the following table to
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Unit A Reproduction

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