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D3.2.2—Genetic crosses in flowering plants

Genetic crosses in flowering plants use parental genotypes, gametes and offspring ratios to infer inheritance patterns in inheritance problems in inheritance problems.

Syllabus
First assessment 2025
Objective
D3.2.2
Level
HL

Exam analysis

Chance of appearing2%of analysed past papers
Latest appearanceMay 2015
Most common paperPaper1
Typical marks1

Common command terms

  • Identify

Recent exam appearances

May 2015Paper1 ["HL"] · TZ113[ 1 ]D3.2.2—Genetic crosses in flowering plants
May 2014Paper1 ["HL"] · TZ210[ 1 ]D3.2.2—Genetic crosses in flowering plants
Practice this objective

Coverage 2014–2015 · Updated 16 Jul 2026

Concept essentials

  • Parental genotypes determine the gametes available in a cross.
  • Offspring ratios can reveal whether a parent is homozygous or heterozygous.
  • Controlled pollination in plants allows inheritance predictions to be tested.
ConceptIB Biology HL