Skip to content
Biology Simulations
Genetics & informationA-level

Gene expression

How does a sequence of DNA bases become a sequence of amino acids?

Follow a message from DNA to mRNA, then watch a ribosome build a polypeptide chain.

Open simulation

Explore at your own pace. Pause, look closer, play again.

Gene expression simulation showing RNA polymerase, DNA strands and a growing RNA message during transcription.
Gene expressionView from the simulation

Look closer.

  1. Follow complementary base pairing during transcription.
  2. Connect mRNA codons, tRNA anticodons and the growing chain.
  3. Compare silent, missense and early-stop substitutions.