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 A3.1 Diversity of organisms
A3.1.1 Variation between organisms as a defining feature of life
A3.1.2 Species as groups of organisms with shared traits
A3.1.3 Binomial system for naming organisms
A3.1.4 Biological species concept
A3.1.5 Difficulties distinguishing between populations and species
A3.1.6 Diversity in chromosome numbers of plant and animal species
A3.1.7 Karyotyping and karyograms
A3.1.8 Unity and diversity of genomes within species
A3.1.9 Diversity of eukaryote genomes
A3.1.10 Comparison of genome sizes
A3.1.11 Current and potential future uses of whole genome sequencing
A3.1.12 Difficulties applying the biological species concept (HL)
A3.1.13 Chromosome number as a shared trait within a species (HL)
A3.1.14 Engagement with local plant or animal species to develop a dichotomous key (HL)
A3.1.15 Identification of species from environmental DNA in a habitat using barcodes (HL)
