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 A4.1 Evolution and speciation
A4.1.1 Evolution as change in the heritable characteristics of a population
A4.1.2 Evidence for evolution from base sequences in DNA or RNA and amino acid sequences
A4.1.3 Evidence for evolution from selective breeding of domesticated animals and crop plants
A4.1.4 Evidence for evolution from homologous structures
A4.1.5 Convergent evolution as the origin of analogous structures
A4.1.6 Speciation by splitting of pre-existing species
A4.1.7 Roles of reproductive isolation and differential selection in speciation
A4.1.8 Differences and similarities between sympatric and allopatric speciation (HL)
A4.1.9 Adaptive radiation as a source of biodiversity (HL)
A4.1.10 Barriers to hybridization and sterility of interspecific hybrids (HL)
A4.1.11 Abrupt speciation in plants by hybridization and polyploidy (HL)
