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CAIE IGCSE Biology 1.2.5 Classification Systems Aim to Reflect Questions

Practise reading branching classifications to identify recent common ancestors and explaining how anatomical or molecular evidence can revise evolutionary relationships.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify the pair of groups with the most recent common ancestor from a branching classification diagram
  • interpret matching amino-acid sequences as evidence of shared ancestry rather than shared diet

CAIE IGCSE Biology 1.2.5 Classification Systems Aim to Reflect Questions question 1

[Maximum number: 1]

Two animals have an identical sequence of amino acids in one of the proteins found in their cells.
What does this indicate about these animals?

A

They have been eating the same types of food.

B

They have not been exposed to substances that cause mutation.

C

They must be members of the same genus.

D

They share an ancestor.

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