a. Explain how a population of antibiotic-resistant bacteria might develop from non-resistant bacteria.
The antibiotics kill the majority of the bacteria, but a small percentage of the population mutate and become resistant. These survive, causing variation in the strains of bacteria. The resistant gene is passed on to the offspring, causing the size of resistant population to increase.
b. Suggest two reasons why it is an advantage to keep farm animals disease free.
1. To prevent diseases spreading to other animals and humans.
2. So that energy can be used to produce good products e.g. milk, instead of being used to repare the body.
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