Students conducted preliminary experiments across different species to analyse their DNA base composition - HSC - SSCE Biology - Question 26 - 2016 - Paper 1

To plot the graph, follow these steps:

1. Prepare the Data: Use the provided table to extract the values for % Adenine and % Guanine for each species.

   • Species A: % Adenine = 38, % Guanine = 12
   • Species B: % Adenine = 26, % Guanine = 22
   • Species C: % Adenine = 8, % Guanine = 40
   • Species D: % Adenine = 20, % Guanine = 32
   • Species E: % Adenine = 33, % Guanine = 18

2. Draw the Axes: On the provided grid, label the x-axis as '% Adenine' and the y-axis as '% Guanine'. Ensure that both axes are marked appropriately to accommodate the ranges of data.

3. Plot the Points: For each species, locate the point on the graph corresponding to its % Adenine and % Guanine values. For example, plot a point for Species A at (38, 12) and continue for the other species.

4. Draw the Line of Best Fit: Once all points are plotted, visually assess the alignment of the points and draw a straight line that best represents the trend of the data. The line should minimize the distances from all points to the line itself.