D3.2.13—Pedigree charts
Pedigree charts use family relationships and phenotypes to infer genotypes, carriers and likely inheritance patterns in inheritance problems in inheritance problems.
- Syllabus
- First assessment 2025
- Objective
- D3.2.13
- Level
- SL
Exam analysis
Chance of appearing12%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper1
Typical marks1
Common command terms
- Identify
- Deduce
- Determine
- Draw
- Calculate
- State
- Explain
Recent exam appearances
November 2025Paper1A ["SL"] · TZ120[ 1 ]D3.2.13—Pedigree charts
May 2025Paper2 ["SL"] · TZ34(b)(ii)[ 2 ]D3.2.13—Pedigree charts
May 2025Paper2 ["SL"] · TZ34(b)(i)[ 1 ]D3.2.13—Pedigree charts
May 2025Paper1A ["SL"] · TZ113[ 1 ]D3.2.13—Pedigree charts
November 2024Paper2 ["SL"] · TZ13(b)[ 2 ]D3.2.13—Pedigree charts
Practice this objective
Coverage 2010–2025 · Updated 16 Jul 2026
Concept essentials
- Pedigrees use affected and unaffected relatives to infer hidden genotypes.
- Unaffected parents with an affected child can indicate recessive inheritance.
- Sex-linked traits must be traced through X chromosome transmission.