IB skill practice

Analyse molecular evolution and phylogenetics

Paper 1, Paper 2 5 marks Difficulty 4

Use molecular evidence for relatedness

A molecular comparison in a Wellington plant productivity lab shows two species differ by 3 DNA bases, while each differs from a third species by 31 bases. Interpret the evolutionary relationship. 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.