Question

24. Over the past several decades, natural selection has caused populations of Staphylococci aureus (an infectious wound bacterium) to evolve resistance to most antibiotics. If antibiotic use were stopped, what would you predict would happen to these S. aureus populations? a. They will go extinct without the antibiotic. b. The frequency of resistant forms will increase in these populations. c. The populations will begin colonizing new environments. d. The frequency of nonresistant forms will increase in these populations. 25. Natural selection occurs because organisms within a particular species have... c. the ability to change colour to suit the background variation due to differences in their genes the ability to pass on characteristics acquired over their lifetime fewer offspring than are able to survive Both b and c are correct e.

Answer 1

Question

24. If the antibiotic use were stopped, the non-resistant form of S.aureus(bacteria), will increase in number as antibiotics is not present. Hence, option d is correct.

25. Natural selection occur because of the presence of variation in the individuals and the ability of the individual to pass trait from one generation to another. Hence, option e is correct.