A 3.2 Classification & Cladistics (HL)

Syllabus statements

A3.2.1 AHL Need for classification of organisms

A3.2.2 AHL Difficulties classifying organisms into the traditional hierarchy of taxa

A3.2.3 AHL Advantages of classification corresponding to evolutionary relationships

A3.2.4 AHL Clades as groups of organisms with common ancestry and shared characteristics

A3.2.5 AHL Gradual accumulation of sequence differences as the basis for estimates of when clades diverged from a common ancestor"

A3.2.6 AHL Base sequences of genes or amino acid sequences of proteins as the basis for constructing cladograms"

A3.2.7 AHL Analysing cladograms

A3.2.8 AHL Using cladistics to investigate whether the classification of groups corresponds to evolutionary relationships

A3.2.9 AHL Classification of all organisms into three domains using evidence from rRNA base sequences