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
- SL
What you’ll learn
15 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 appearing48%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper1
Most tested objectives
- D3.2.9—ABO blood groups20 questions
- D3.2.13—Pedigree charts20 questions
- D3.2.5—Dominant and recessive alleles19 questions
Common question formats
- Definition or recall
- Structured response
- Diagram interpretation
- Data analysis
- Calculation
- Graph interpretation
- Comparison
Exam question appearances
November 2025Paper1B ["SL"] · TZ34(d)[ 3 ]D3.2.9—ABO blood groups
November 2025Paper1A ["SL"] · TZ120[ 1 ]D3.2.13—Pedigree charts
May 2025Paper2 ["SL"] · TZ15(c)[ 3 ]D3.2.5—Dominant and recessive alleles
May 2025Paper2 ["SL"] · TZ34(b)(ii)[ 2 ]D3.2.13—Pedigree charts
May 2025Paper2 ["SL"] · TZ34(b)(i)[ 1 ]D3.2.13—Pedigree charts
Coverage 2010–2025 · Updated 16 Jul 2026