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Making a DNA Model with Candy and Toothpicks
Red licorice twists as the sugar-phosphate backbone, four colors of gumdrops as nitrogen bases: making a DNA model with candy turns one of biology’s biggest concepts into something you can hold in your hands.
This lab sheet guides your student through building a double helix using red licorice twists, toothpicks, and small gumdrops or jelly candies assigned to each of the four nitrogen bases: adenine, thymine, cytosine, and guanine. Your homeschooler records a hypothesis, follows a six-step procedure that includes choosing a base sequence and gently twisting the backbone into a helix, then draws and labels the finished model in the results section. Designed for grades 5-7, the sheet also includes a “Did You Know” fact about the full length of human DNA when stretched out.
Making a DNA model with candy fits naturally into a genetics or cell biology unit study, either as an introduction to base pairing rules before moving into heredity, or as a hands-on review after your student has read about DNA structure. The analysis questions push beyond the build itself, asking what the sides and rungs represent, why A always pairs with T, and what might happen if the base order changed. Completing the sheet demonstrates that your student understands both the physical structure of the double helix and the functional role DNA plays in living things.
Grades 5-7 homeschoolers love making a DNA model with candy and toothpicks. Every material on this list is a household staple.
Investigating Making a DNA Model with Candy Step by Step
Usage Notes
Red licorice twists, toothpicks, and small gumdrops or jelly candies in four colors cover everything on the materials list, and every one of those items comes from a grocery store. Scissors are required for adult use, as the sheet notes explicitly. The safety reminder at the bottom of the procedure section flags that students should not eat the model during the experiment and should wash hands before and after handling.
Printing Tips
Standard copy paper works fine here because students draw their model in the results box rather than writing heavily throughout. Slip the sheet into a lab notebook alongside your genetics unit, or keep it as a loose sheet on a clipboard while your student builds at the table.