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How to Create a DNA Model for a School Project

DNA (Deoxyribonucleic acid) is found in all forms of life and determines the genetic makeup of all beings. DNA code is made up of four chemical bases, including adenine, guanine, cytosine and thymine. Students can better understand the DNA strand and how it works by creating a DNA model out of simple materials. The model can also show various functions of a DNA double helix, such as replication and splicing.

Things You'll Need

Fishing line / thin string
Licorice sticks / ropes (red and black)
Gumdrops, jelly beans, or marshmallows (in four colors)
Toothpicks

Instructions

- 1
  Assign a color to represent each chemical base. Have the small gumdrops or jellybeans represent the four bases (adenine, guanine, cytosine and thymine) and the alternating black and red licorice represent the sugar and phosphate molecules.
- 2
  Connect alternating pairs of bases, or gumdrops, with toothpicks. Pair only the bases that are typically paired in DNA. Cut the licorice into small, even pieces.
- 3
  Connect the pairs of gumdrop strands to the licorice, one piece on each end of the toothpick. Use fishing line through the licorice to connect sugar phosphate backbone. Continue connecting until you reach the desired length. Twist the model so that it resembles a spiral, or a double helix.

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