1. Copyright © 2009 Pearson Education, Inc. Active Lecture Questions for Biology: Concepts & Connections, Sixth Edition Campbell, Reece, Taylor, Simon, and Dickey Chapter 8 The Cellular Basis of Reproduction and Inheritance

2. Copyright © 2009 Pearson Education, Inc. Concept Check Examine the micrograph of a growing onion root tip. The high- lighted cells are in various stages of the cell cycle—most are in the mitotic phase of the cell cycle. Which of the lists below correctly identify the mitotic phases for the circled cells? 1.2. 3.4. 1. InterphaseProphaseProphaseProphase 2. ProphaseTelophase Interphase Interphase 3. Metaphase MetaphaseAnaphase Metaphase 4. TelophaseAnaphaseTelophaseTelophase 5. AnaphaseInterphase MetaphaseAnaphase

3. Copyright © 2009 Pearson Education, Inc. Answer Examine the micrograph of a growing onion root tip. The high- lighted cells are in various stages of the cell cycle — most are in the mitotic phase of the cell cycle. Which of the lists below correctly identify the mitotic phases for the circled cells? 1.2. 3.4. 1. Prophase 2. Interphase 3. Metaphase 4. Telophase 5. Anaphase

4. Copyright © 2009 Pearson Education, Inc. Concept Check Use the following choices to complete the table at the left: 1)Mitosis 2)Meiosis 3)Both Required for growth in multicellular organisms Produces haploid gametes Replicates nuclear DNA Asexual reproduction Sexual reproduction Replaces damaged cells

5. Copyright © 2009 Pearson Education, Inc. Answer Required for growth in multicellular organisms 1) Mitosis Produces haploid gametes Replicates nuclear DNA Asexual reproduction Sexual reproduction Replaces damaged cells Use the following choices to complete the table at the left: 1)Mitosis 2)Meiosis 3)Both

6. Copyright © 2009 Pearson Education, Inc. Answer Required for growth in multicellular organisms 1) Mitosis Produces haploid gametes2) Meiosis Replicates nuclear DNA Asexual reproduction Sexual reproduction Replaces damaged cells Use the following choices to complete the table at the left: 1)Mitosis 2)Meiosis 3)Both

7. Copyright © 2009 Pearson Education, Inc. Answer Required for growth in multicellular organisms 1) Mitosis Produces haploid gametes2) Meiosis Replicates nuclear DNA3) Both Asexual reproduction Sexual reproduction Replaces damaged cells Use the following choices to complete the table at the left: 1)Mitosis 2)Meiosis 3)Both

8. Copyright © 2009 Pearson Education, Inc. Answer Required for growth in multicellular organisms 1) Mitosis Produces haploid gametes2) Meiosis Replicates nuclear DNA3) Both Asexual reproduction1) Mitosis Sexual reproduction Replaces damaged cells Use the following choices to complete the table at the left: 1)Mitosis 2)Meiosis 3)Both

9. Copyright © 2009 Pearson Education, Inc. Answer Required for growth in multicellular organisms 1) Mitosis Produces haploid gametes2) Meiosis Replicates nuclear DNA3) Both Asexual reproduction1) Mitosis Sexual reproduction2) Meiosis Replaces damaged cells Use the following choices to complete the table at the left: 1)Mitosis 2)Meiosis 3)Both

10. Copyright © 2009 Pearson Education, Inc. Answer Required for growth in multicellular organisms 1) Mitosis Produces haploid gametes2) Meiosis Replicates nuclear DNA3) Both Asexual reproduction1) Mitosis Sexual reproduction2) Meiosis Replaces damaged cells1) Mitosis Use the following choices to complete the table at the left: 1)Mitosis 2)Meiosis 3)Both

11. Copyright © 2009 Pearson Education, Inc. Concept Check The diagram above represents the cell cycle through time of a eukaryotic organism. Which of the four phases of the cell cycle is the most variable in length of time, depending on the type of cell? 1)G 1 phase 2)S phase 3)G 2 phase 4)M phase

12. Copyright © 2009 Pearson Education, Inc. Answer The diagram above represents the cell cycle through time of a eukaryotic organism. Which of the four phases of the cell cycle is the most variable in length of time, depending on the type of cell? 1)G 1 phase

13. Copyright © 2009 Pearson Education, Inc. Concept Check Which of the following contribute to variation in offspring for sexually reproducing organisms? 1)Independent orientation of tetrads during meiosis 2)Crossing over of during tetrad formation 3)Sexual reproduction 4)All of the above

14. Copyright © 2009 Pearson Education, Inc. Answer Which of the following contribute to variation in offspring for sexually reproducing organisms? 4)All of the above

15. Copyright © 2009 Pearson Education, Inc. Interpreting Data Time (hours) Number of Cells Stage 01 0.52 464 610,000 1030,000 1101 million This table represents the rate of cell division for the fertilized egg of an African frog (Xenopus). If each of the early divisions occur at the same time, how many divisions take place in the first 4 hours? 1)3 divisions 2)4 divisions 3)5 divisions 4)6 divisions

16. Copyright © 2009 Pearson Education, Inc. Answer Time (hours) Number of Cells Stage 01 0.52 464 610,000 1030,000 1101 million This table represents the rate of cell division for the fertilized egg of an African frog (Xenopus). If each of the early divisions occur at the same time, how many divisions take place in the first 4 hours? 4)6 divisions

17. Copyright © 2009 Pearson Education, Inc. Interpreting Data Time (hours) Number of Cells Stage 01 0.52 464 610,000 1030,000 1101 million Which form of cell division accounts for the development of the frog? 1)mitosis 2)meiosis 3)Both mitosis and meiosis

18. Copyright © 2009 Pearson Education, Inc. Answer Time (hours) Number of Cells Stage 01 0.52 464 610,000 1030,000 1101 million Which form of cell division accounts for the development of the frog? 1)mitosis

19. Copyright © 2009 Pearson Education, Inc. Interpreting Data Time (hours) Number of Cells Stage 01 0.52 464 610,000 1030,000 1101 million During which stage is the rate of mitosis the fastest (most cells per hour)? 1)Between time 0 and time 4 hours. 2)Between time 4 hours and time 10 hours. 3)Between time 10 hours and time 110 hours.

20. Copyright © 2009 Pearson Education, Inc. Answer Time (hours) Number of Cells Stage 01 0.52 464 610,000 1030,000 1101 million During which stage is the rate of mitosis the fastest (most cells per hour)? 3)Between time 10 hours and time 110 hours.

21. Copyright © 2009 Pearson Education, Inc. Biology and Society The incidence of births with Down’s syndrome increases markedly after the age of 35 for mothers. Do you think that mothers over the age of 35 should seek fetal testing?

22. Copyright © 2009 Pearson Education, Inc. Biology and Society These are two mammograms—the one on the left is normal and the one on the right indicates a tumor. Genetic tests are now available to screen for women with a high genetic risk for developing breast cancer. Some women in this situation have opted for a radical mastectomy before the appearance of a tumor. As a doctor would you consider advising your patient in this manner?

23. Copyright © 2009 Pearson Education, Inc. Biology and Society One of the first human cell lines to survive indefinitely was that derived from a cancer patient who died in 1951. Known as the HeLa line for Henrietta Lacks, the cell line continues today in laboratories throughout the world and is even available for high school classrooms to study karyotyping. In 1951 people didn’t fully realize the potential applications of unique cells or DNA. Do you think that a patient should retain all rights to their cells or DNA during medical procedures?