In this activity (on pages 34-39), learners make a fairly detailed model of DNA using licorice and gumdrops. The sugar and phosphate backbone of DNA is represented by alternating red and black licorice, and the base pairs are represented by gumdrops arranged so that gumdrop colors are paired. After a pair of learners have made a DNA section, they find another team and link them up to make a model of a gene. They then split the model and "copy" it using the base pair rules from earlier, comparing their copy to the original to see if there are any differences (mutations).