Environmental conditions
Lactose
Absent
Glucose
Present
Mutations — select one allele per gene
Each gene group has selectable allele buttons. The selected allele is announced as pressed.
lacI — repressor protein
lacP — promoter
lacO — operator
Structural genes
lacZ
lacY
lacA
Simulation Controls
Simulation output
This panel contains an animated lac operon diagram. The diagram is decorative for screen-reader users, and the current simulation status is announced below.