IB skill practice

Analyse nucleic acids, chromosomes, and gene regulation

Paper 1, Paper 2 5 marks Difficulty 4

Analyse operon-style gene regulation

A diagram in a Melbourne HL genetics workshop shows a repressor bound to an operator beside a structural gene, and the mRNA transcript is absent. Explain the gene-regulation outcome. Enter the answer and choose the interpretation that best matches the HL Biology evidence.

Worked practice: biological evidence and answer

Use the labelled biological evidence first, then connect it to the final answer.