Page 08 14. A student planned to measure the activity of catalase by using an oxygen probe to measure oxygen production. As part of their pilot study, the student used a standard sample with an oxygen concentration of 22·00% to test the accuracy and precision of the probe. Four readings of the standard sample were taken and the results obtained are shown in the table. Reading 1 2 3 4 Oxygen concentration (%) 20·94 20·93 20·93 20·94 The results indicate the measurements taken were A accurate and precise B accurate but not precise C precise but not accurate D neither accurate nor precise. 15. Which of the following formulae would allow relative fitness to be calculated? A frequency of a particular genotype after selection frequency of a particular genotype before selection B frequency of a particular genotype before selection frequency of a particular genotype after selection C number of surviving offspring of a particular genotype number of surviving offspring of other genotypes D number of surviving offspring of other genotypes number of surviving offspring of a particular genotype