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A1.1 Water

A1.2 Nucleic acids

A2.1 Origins of cells (HL)

A2.2 Cell structure

A2.3 Viruses (HL)

A3.1 Diversity of organisms

A3.2 Classification and cladistics (HL)

A4.1 Evolution and speciation

A4.2 Conservation of biodiversity

B1.1 Carbohydrates and lipids

B1.2 Proteins

B2.1 Membranes and membrane transport

B2.2 Organelles and compartmentalization

B2.3 Cell specialization

B3.1 Gas exchange

B3.2 Transport

B3.3 Muscle and motility (HL)

B4.1 Adaptation to environment

B4.2 Ecological niches

C1.1 Enzymes and metabolism

C1.2 Cell respiration

C1.3 Photosynthesis

C2.1 Chemical signalling (HL)

C2.2 Neural signalling

C3.1 Integration of body systems

C3.2 Defense against disease

C4.1 Populations and communities

C4.2 Transfer of energy and matter

D1.1 DNA replication

D1.2 Protein synthesis

D1.3 Mutations and gene editing

D2.1 Cell and nuclear division

D2.2 Gene expression (HL)

D2.3 Water potential

D3.1 Reproduction

D3.2 Inheritance

D3.3 Homeostasis

D4.1 Natural selection

D4.2 Sustainability and change

D4.3 Climate change

IB Biology Topic D3.2: Inheritance Lessons

Written by IB Experts

This lesson delivers structured, step-by-step lessons that guide students through every part of the IB Biology syllabus for D3.2 Inheritance. These lessons simplify complex ideas like molecular biology, evolutionary mechanisms, and homeostasis, while worked examples show how to approach IB-style questions.

Designed for both HL and SL learners, RevisionDojo lessons ensure students not only understand the theory but also know how to apply it in IB Paper exam situations.

With clear explanations, active learning checks, and a syllabus-first design, RevisionDojo makes revision less overwhelming and more effective.

D3.2.1 Production of haploid gametes in parents

D3.2.2 Methods for conducting genetic crosses in flowering plants

D3.2.3 Genotype as the combination of alleles inherited by an organism

D3.2.4 Phenotype

D3.2.5 Effects of dominant and recessive alleles on phenotype

D3.2.6 Phenotypic plasticity

D3.2.7 Phenylketonuria

D3.2.8 Single-nucleotide polymorphisms and multiple alleles in gene pools

D3.2.9 ABO blood groups as an example of multiple alleles

D3.2.10 Incomplete dominance and codominance

D3.2.11 Sex determination in humans and inheritance of genes on sex chromosomes

D3.2.12 Haemophilia as an example of a sex-linked genetic disorder

D3.2.13 Pedigree charts to deduce patterns of inheritance of genetic disorders

D3.2.14 Continuous variation due to polygenic inheritance and/or environmental factors

D3.2.15 Box-and-whisker plots to represent data for a continuous variable such as student height

D3.2.16 Segregation and independent assortment of unlinked genes in meiosis (HL)

D3.2.17 Punnett grids for predicting genotypic and phenotypic ratios in dihybrid crosses (HL)

D3.2.18 Loci of human genes and their polypeptide products (HL)

D3.2.19 Autosomal gene linkage (HL)

D3.2.20 Recombinants in crosses involving two linked or unlinked genes (HL)

D3.2.21 Use of a chi-squared test on data from dihybrid crosses (HL)