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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 D4.1: Natural Selection Lessons

Written by IB examiners

This lesson delivers structured, step-by-step lessons that guide students through every part of the IB Biology syllabus for D4.1 Natural selection. 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.

D4.1.1 Natural selection as the mechanism driving evolutionary change

D4.1.2 Roles of mutation and sexual reproduction

D4.1.3 Overproduction of offspring and competition for resources

D4.1.4 Abiotic factors as selection pressures

D4.1.5 Differences between individuals in adaptation, survival and reproduction

D4.1.6 Requirement that traits are heritable for evolutionary change to occur

D4.1.7 Sexual selection as a selection pressure in animal species

D4.1.8 Modelling of sexual and natural selection

D4.1.9 Concept of the gene pool (HL)

D4.1.10 Allele frequencies of geographically isolated populations (HL)

D4.1.11 Changes in allele frequency in the gene pool (HL)

D4.1.12 Differences between directional, disruptive and stabilizing selection (HL)

D4.1.13 Hardy–Weinberg equation and calculations of allele or genotype frequencies (HL)

D4.1.14 Hardy–Weinberg conditions (HL)

D4.1.15 Artificial selection by deliberate choice of traits (HL)

Written by IB examiners

This lesson delivers structured, step-by-step lessons that guide students through every part of the IB Biology syllabus for D4.1 Natural selection. 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.

D4.1.1 Natural selection as the mechanism driving evolutionary change

D4.1.2 Roles of mutation and sexual reproduction

D4.1.3 Overproduction of offspring and competition for resources

D4.1.4 Abiotic factors as selection pressures

D4.1.5 Differences between individuals in adaptation, survival and reproduction

D4.1.6 Requirement that traits are heritable for evolutionary change to occur

D4.1.7 Sexual selection as a selection pressure in animal species

D4.1.8 Modelling of sexual and natural selection

D4.1.9 Concept of the gene pool (HL)

D4.1.10 Allele frequencies of geographically isolated populations (HL)

D4.1.11 Changes in allele frequency in the gene pool (HL)

D4.1.12 Differences between directional, disruptive and stabilizing selection (HL)

D4.1.13 Hardy–Weinberg equation and calculations of allele or genotype frequencies (HL)

D4.1.14 Hardy–Weinberg conditions (HL)

D4.1.15 Artificial selection by deliberate choice of traits (HL)

A - Unity and Diversity

B - Form and Function

C - Interaction and Interdependence

D - Continuity and Change

IB Biology Topic D4.1: Natural Selection Lessons

A - Unity and Diversity

B - Form and Function

C - Interaction and Interdependence

D - Continuity and Change

IB Biology Topic D4.1: Natural Selection Lessons

Lessons for D4.1 Natural selection - IB

Lessons for D4.1 Natural selection - IB