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IB Biology HL 1.3.1 Gene mutations and sequence consequences Question Bank

Practise IB Biology HL 1.3.1 by analysing gene-mutation types and their consequences for alleles and gene products.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse how substitution, insertion or deletion changes a gene sequence and reading frame.
  • Link a nucleotide change to an altered allele, transcript or polypeptide.
  • Evaluate a mutation explanation by distinguishing mutation from natural selection or chromosome non-disjunction.

D1.3.1—Gene mutations question 1

[Maximum number: 1]

Duchenne muscular dystrophy (DMD) is a sex-linked genetic disorder caused by a recessive allele resulting from mutations in the X-linked dystrophin gene. This causes the degeneration of cardiac and skeletal muscle. These mutations can include deletions, insertions and base substitution mutations.

Distinguish between deletion and insertion mutations.

Figure for Question D1.3.1—Gene mutations question 1 — IB Biology HL
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