2023-11-28, 1 : 24 PM Quiz 4 Natural Selection (Opens Friday, Sept 29, due Thursday, Oct 5, 11 : 59 pm): Attempt review | eClass Page 1 of 6 https://eclass.yorku.ca/mod/quiz/review.php ? attempt=5108664&cmid=2584953 SC/BIOL1001 A - Biology II - Evolution, Ecology, Biodiversity and Conservation Biology (Fall 2023-2024) ❯ Quiz 4 Natural Selection (Opens Friday, Sept 29, due Thursday, Oct 5, 11 : 59 pm) Question 1 Correct Mark 1.00 out of 1.00 Started on Thursday, 5 October 2023, 4 : 21 PM State Finished Completed on Thursday, 5 October 2023, 5 : 33 PM Time taken 1 hour 12 mins Marks 9.00/10.00 Grade 90.00 out of 100.00 Select one: Evolution by natural selection is a powerful force of change. What keeps populations from becoming perfectly adapted to their environment ? a. Mutations introduce new variation into a population. b. All of these.  c. Random events where survival is not related to adaptations/fitness. d. Environments change, so different alleles become more fit. The correct answer is: All of these.

2023-11-28, 1 : 24 PM Quiz 4 Natural Selection (Opens Friday, Sept 29, due Thursday, Oct 5, 11 : 59 pm): Attempt review | eClass Page 2 of 6 https://eclass.yorku.ca/mod/quiz/review.php ? attempt=5108664&cmid=2584953 Question 2 Correct Mark 1.00 out of 1.00 Select one: Which of the following statements describes evolution by natural selection of Mycobacterium tuberculosis bacteria in their new environment ? a. The drug-susceptibility trait is an adaptation to the environment in which human hosts are medicated with the antibiotic rifampin. b. The drug-susceptibility trait is an adaptation to the environment of antibacterial soaps. c. The drug-resistance trait is an adaptation to the environment in which human hosts travel worldwide and are exposed to new strains of bacteria. d. The drug-resistance trait is an adaptation to the environment in which human hosts are medicated with the antibiotic rifampin.  Your answer is correct. The correct answer is: The drug-resistance trait is an adaptation to the environment in which human hosts are medicated with the antibiotic rifampin.

2023-11-28, 1 : 24 PM Quiz 4 Natural Selection (Opens Friday, Sept 29, due Thursday, Oct 5, 11 : 59 pm): Attempt review | eClass Page 4 of 6 https://eclass.yorku.ca/mod/quiz/review.php ? attempt=5108664&cmid=2584953 Question 5 Correct Mark 1.00 out of 1.00 Question 6 Correct Mark 1.00 out of 1.00 Question 7 Correct Mark 1.00 out of 1.00 Select one: If a storm kills many small birds in a population, but only a few medium- and large-sized ones, which type of selection is likely operating ? a. directional  b. stabilizing c. disruptive d. intersexual The correct answer is: directional Select one: In the bell-shaped curves that are used in the book to illustrate the different types of selection, the x -axis (horizontal direction) of the graph represents which of the following ? a. The amount of time that has passed. b. The value of a characteristic.  c. The number of individuals. Your answer is correct. The correct answer is: The value of a characteristic. Select one: Stabilizing selection favours________________. a. intermediate phenotypes  b. phenotypes at both extremes c. convergent phenotypes d. phenotypes at one end of the distribution The correct answer is: intermediate phenotypes

2023-11-28, 1 : 24 PM Quiz 4 Natural Selection (Opens Friday, Sept 29, due Thursday, Oct 5, 11 : 59 pm): Attempt review | eClass Page 5 of 6 https://eclass.yorku.ca/mod/quiz/review.php ? attempt=5108664&cmid=2584953 Question 8 Correct Mark 1.00 out of 1.00 Question 9 Correct Mark 1.00 out of 1.00 Select one: You measure the variation in the toe length of all of the students in BIOL 1001 and arrive at numbers that reflect a wide range of variation, with some short toes, some long toes, and toes of just about every length in between. Your conclusion is that toe length is subject to ___________________. a. quantitative variation  b. microevolution c. qualitative variation The correct answer is: quantitative variation Select one: A sudden reduction in population size generally results in _____________. a. genetic drift and decreased genetic variation  b. natural selection and random genetic variation c. genetic drift and increased genetic variation d. natural selection and increased genetic variation The correct answer is: genetic drift and decreased genetic variation