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IB Biology HL A3.1.7 Karyotyping and Karyograms Questions

Construct and analyse karyograms to identify sex, ploidy and abnormalities, and use chromosome diagrams to explain prenatal diagnosis and chromosome fusion.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Arrange and analyse karyograms using chromosome size, centromere position and banding patterns.
  • Use karyograms to identify sex, haploid number and chromosome abnormalities such as trisomy 21.
  • Explain prenatal karyotype diagnosis from chorionic-villus chromosomes and use chromosome diagrams to justify fusion evidence.

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Study A3.1.7—Karyotyping and karyograms conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL A3.1.7 Karyotyping and Karyograms Questions 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 IB Biology HL A3.1.7 Karyotyping and Karyograms Questions 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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