1. © 2010 Pearson Education, Inc. Clicker Questions for use with Classroom Response Systems Campbell Essential Biology, Fourth Edition – Simon, Reece, and Dickey Campbell Essential Biology with Physiology, Third Edition – Simon, Reece, and Dickey Questions prepared by Brad Williamson, updated by Mike Tveten Chapter 8 Cellular Reproduction: Cells from Cells

2. © 2010 Pearson Education, Inc. Concept Check Examine the micrograph of a growing onion root tip. The circled cells are in various stages of the cell cycle—most are in the mitotic phase. Which of the lists below correctly identifies the mitotic phases for the circled cells? a.b. c.d. 1. interphaseprophaseprophaseprophase 2. prophasetelophaseinterphaseinterphase 3. metaphasemetaphaseanaphasemetaphase 4. anaphaseanaphasetelophasetelophase 5. telophaseinterphasemetaphaseanaphase

3. © 2010 Pearson Education, Inc. Concept Check Which of the following is an actual difference between mitosis and meiosis? a.A single cell is divided into two cells in mitosis and four cells in meiosis. b.Mitosis produces haploid cells, and meiosis produces diploid cells. c.Mitosis involves two cellular divisions, and meiosis has only one cellular division. d.The chromosomes replicate before mitosis and meiosis, but in meiosis they replicate again between the first and second divisions.

4. © 2010 Pearson Education, Inc. Concept Check The diagram on the right 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? a.G 1 phase b.S phase c.G 2 phase d.M phase

5. © 2010 Pearson Education, Inc. Concept Check Which of the following contributes to variation in offspring for sexually reproducing organisms? a.independent orientation of tetrads during meiosis b.crossing over of homologous chromosomes during tetrad formation c.sexual reproduction d.all of the above

6. © 2010 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 occurs at the same time, how many divisions take place in the first four hours? a.3 divisions b.4 divisions c.5 divisions d.6 divisions

7. © 2010 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? a.mitosis b.meiosis c.both mitosis and meiosis

8. © 2010 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)? a.between time 0 and time 4 hours b.between time 4 hours and time 10 hours c.between time 10 hours and time 110 hours

9. © 2010 Pearson Education, Inc. Biology and Society The incidence of births with Down syndrome increases markedly after the age of 35 for mothers. Do you think that mothers over the age of 35 should seek fetal testing? Strongly Agree Strongly Disagree A. E. C. B. D.

10. © 2010 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? Strongly Agree Strongly Disagree A. E. C. B. D.

11. © 2010 Pearson Education, Inc. Biology and Society One of the first human cell lines to survive indefinitely was 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 his or her cells or DNA during medical procedures? Strongly Agree Strongly Disagree A. E. C. B. D.