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IB Biology HL 3.1.7 Karyotyping and Karyograms

Practise IB Biology HL 3.1.7 by evaluating karyograms, chromosome fusion evidence and species-level chromosome differences.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Use chromosome fusion, banding and centromere evidence to explain human chromosome 2 ancestry.
  • Evaluate karyograms for species identity, haploid number, sex and chromosome abnormalities.

A3.1.7—Karyotyping and karyograms question 1

[Maximum number: 4]

The table shows the number of amino acids that are different in the sequences of the protein FOXP2 from a human compared with four other primate species.

Table for Question A3.1.7—Karyotyping and karyograms question 1 — IB Biology HL

Using evidence from the diagrams, justify the hypothesis that chromosome 2 in humans arose from the fusion of chromosomes 12 and 13 with a shared primate ancestor.

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