PHYSICAClass 12 Botany simulations · Molecular Basis of Inheritance
The lac operon
Add or remove lactose and see whether the repressor blocks the operator or RNA polymerase transcribes the z, y, a genes.
What to notice
Without lactose the repressor binds the operator and the structural genes stay switched off.
Key relation
Lactose (inducer) inactivates the repressor → genes z, y, a transcribed
Try this
Add lactose. Which three enzymes are now produced?
What you can change
- Lactose in medium: choose Present, Absent
More in Molecular Basis of Inheritance
- Transcription and translation
- DNA double helix
- DNA fingerprinting with VNTRs
- Semiconservative replication (Meselson–Stahl)
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