Assignment 5C: Cell Division: The Process of Mitosis and Meiosis Use the following information to answer question 1. Tobacco Smoke Scientists are working hard to learn about causes of cancer. It is known that in general terms, cancer-causing agents produce mutations in a variety of genes that control cell reproduction Cancer can be caused by organisms. For example, when some viruses infect a human cell, the virus DNA inserts itself randomly into the DNA of human cells. Of all the cancer-causing agents to which humans are commonly exposed, tobacco smoke appear to cause the greatest harm. Tobacco is directly responsible for 30% of all cancer deaths in North America. Heavy smoking increases the likelihood of getting lung cancer by 2 000%. Passive (second-hand) smoke is less likely to cause cancer. It is about as harmful as all other forms of air pollution. from Trichopoulos, Li, and Hunter, 1996 1. A researcher wants to develop a study to help determine what percentage of smokers will die from cancer caused by tobacco and its smoke. The researcher gathers two groups of subjects and observes them over a long period of time. Identify the manipulated variable and the responding variable for the study.
Use the following diagram to answer question 9. Process X 1 3 4 DO XX (8 DO Process Y 5 6 7 8 VOY
b. There are two events in melosis that contribute to genetic variation 1. Identify the corresponding stage number in the previous diagram. © ll. Identify the process and explain how it contributes to genetic variation.