Chargaff’s rules state that DNA from any species of an organism should have a 1 to 1 ratio of purine and pyrimidine bases (i.e., A+G = T+C): the amount of guanine should be equal to cytosine, and the amount of adenine should be equal to thymine .

Create a color-coded bar graph to display Chargaff’s Data for 3 of the organisms above, include: Title, label x and y axis, x-axis title, y-axis title, scale. Round to the nearest whole number and be sure to color in your bar graph.