A - Unity and Diversity
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
B - Form and Function
C - Interaction and Interdependence
D - Continuity and Change
View a summary cheatsheet for A3.2 Classification and cladistics (HL)
A3.2.1 Need for classification of organisms (HL)
A3.2.2 Difficulties classifying organisms into the traditional hierarchy of taxa (HL)
A3.2.3 Advantages of classification corresponding to evolutionary relationships (HL)
A3.2.4 Clades as groups of organisms with common ancestry and shared characteristics (HL)
A3.2.5 Gradual accumulation of sequence differences (HL)
A3.2.6 Base sequences of genes or amino acid sequences of proteins (HL)
A3.2.7 Analysing cladograms (HL)
A3.2.8 Using cladistics to investigate evolutionary relationships (HL)
A3.2.9 Classification of all organisms using evidence from rRNA base sequences (HL)
