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IB Biology HL A3.2.8 Hl Testing Classification Correspondence Questions

Test traditional classifications with conserved gene sequences and cladistic evidence, explaining when morphology reflects convergence and reclassification is justified.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Use conserved chloroplast gene sequences and other cladistic evidence to test whether traditional taxa reflect evolutionary relationships.
  • Explain why molecular evidence can overturn morphological similarity as convergence and reclassify organisms into different families.

IB Biology HL A3.2.8 Hl Testing Classification Correspondence Questions question 1

[Maximum number: 1]

The figwort family is a large one consisting of many flowering plants that look similar. For what reason have some members of the family been reclassified into a new family?

A

Cladistic analysis shows the differences in flower structure to be fewer than the shared similarities.

B

DNA analysis shows the similarities in flower shape to be a product of convergent evolution.

C

DNA analysis shows some of the families to have suffered recent mutations in only one gene.

D

DNA analysis shows the similarities between the seed dispersal strategies to be a product of divergent evolution.

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