BIOL 1001 WEEK 5 EXAM WITH ANSWERS 2021

BIOL 1001 WEEK 5 EXAM WITH ANSWERS • Question 1 2 out of 2 points Your friend was diagnosed with strep throat 2 months ago. She was treated with antibiotics for 10 days, but 2 weeks after treatment, the symptoms returned. She was given a different antibiotic, and her symptoms again initially improved but then got worse. What is happening? Choose the best answer. Correct Answer: a. Your friend was originally infected with bacteria that are resistant to at least two antibiotics. • Question 2 3 out of 3 points The phrase “survival of the fittest” is somewhat misleading because it implies that: Correct Answer: b. The best possible organism will evolve • Question 3 2 out of 2 points Which individuals have the greatest fitness in an area where malaria is common? Correct Answer: e. Individuals heterozygous for the normal and sickle cell anemia alleles • Question 4 2 out of 2 points A biologist has been studying two populations of trout in Montana for the last 25 years, when the two populations were established from one common population. In the southern population, the fish now have a slightly different mouth shape. But the northern population hasn’t changed from the original type. The new shape works well in catching the type of prey common in the habitat of the southern population. Which explanation is the most likely explanation of the gene differences in the two populations? Correct Answer: d. The gene that produces the variation is probably still present in a small percentage of the northern population, but since there’s no advantage to having it, individuals with the variation aren’t preferentially selected.