D3.2 Inheritance
Inheritance explains how alleles, chromosomes, meiosis, pedigrees, linkage, variation and statistical tests predict genetic outcomes across generations in inheritance problems.
- Syllabus
- First assessment 2025
- Topic
- D3.2
- Level
- —
What you’ll learn
21 learning objectivesChoose one objective for a focused lesson, or study the complete topic.
Exam analysis
An aggregate view of how the complete D3.2 Inheritance appears across past papers.
Chance of appearing52%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper1
Most tested objectives
- D3.2.13—Pedigree charts35 questions
- D3.2.9—ABO blood groups30 questions
- D3.2.5—Dominant and recessive alleles24 questions
Common question formats
- Definition or recall
- Structured response
- Diagram interpretation
- Data analysis
- Calculation
- Graph interpretation
- Comparison
Exam question appearances
November 2025Paper2 ["HL"] · TZ36(b)[ 2 ]D3.2.19 (HL)—Autosomal gene linkage
November 2025Paper2 ["HL"] · TZ36(a)[ 3 ]D3.2.17 (HL)—Dihybrid crosses
November 2025Paper1B ["SL"] · TZ34(d)[ 3 ]D3.2.9—ABO blood groups
November 2025Paper1A ["HL"] · TZ332[ 1 ]D3.2.6—Phenotypic plasticity
November 2025Paper1A ["HL"] · TZ131[ 1 ]D3.2.19 (HL)—Autosomal gene linkage
Practice this topic
18 original exam-style questions based on the patterns above.
Coverage 2010–2025 · Updated 16 Jul 2026