Biology Abitur Lernzettel / Biology exam preparation –
Classification of Biodiversity, Taxonomy and Cladistics
Table of Contents
Biological Classification
Definition of biological classification
Purpose of classification in biology
Modern classification using genetic analysis
Taxonomy
Definition of taxonomy
Taxonomic hierarchy of organisms
Cladistics
Definition of cladistics
Clades and common ancestry
Cladograms and evolutionary relationships
Structure of Cladograms
• Branches and evolutionary lineages
• Nodes and speciation events
• Root and common ancestors
Purpose of Cladistics
Understanding evolutionary relationships
Predicting traits in related organisms
Tracing speciation events
Natural Classification
Classification based on evolutionary relationships
Artificial Classification
Classification based on observable traits
1
, 1.6 Classification of biodiversity
1. Overview of classification:
Definition:
Biological classification is the process that involves the arrangement of organisms in a hierarchical
series of groups and sub-groups on the basis of their similarities. In the past, similarity was
determined by examining the physical characteristics of an organism. Nowadays, modern
classification uses techniques, including genetic analysis, to better examine similarities between
groups of organisms and thus they can be grouped more precisely.
The main components of classification:
Taxonomic hierarchy: Organisms are classified into hierarchical groups, including Domain, Kingdom,
Phylum, Class, Order, Family, Genus, and Species. Taxonomy is the main method of classification and
helps to better organize all forms life live based on shared characteristics.
Binomial nomenclature: A universal naming system where each species is given a two-part name:
Genus (capitalized) and species (lowercase). This system was developed by Carl Linnaeus and
ensures that each species has a unique and standardized name.
Cladistics: A method of classification that groups species based on common ancestry and
evolutionary traits. It uses cladograms to illustrate evolutionary relationships and shared
characteristics.
2
Classification of Biodiversity, Taxonomy and Cladistics
Table of Contents
Biological Classification
Definition of biological classification
Purpose of classification in biology
Modern classification using genetic analysis
Taxonomy
Definition of taxonomy
Taxonomic hierarchy of organisms
Cladistics
Definition of cladistics
Clades and common ancestry
Cladograms and evolutionary relationships
Structure of Cladograms
• Branches and evolutionary lineages
• Nodes and speciation events
• Root and common ancestors
Purpose of Cladistics
Understanding evolutionary relationships
Predicting traits in related organisms
Tracing speciation events
Natural Classification
Classification based on evolutionary relationships
Artificial Classification
Classification based on observable traits
1
, 1.6 Classification of biodiversity
1. Overview of classification:
Definition:
Biological classification is the process that involves the arrangement of organisms in a hierarchical
series of groups and sub-groups on the basis of their similarities. In the past, similarity was
determined by examining the physical characteristics of an organism. Nowadays, modern
classification uses techniques, including genetic analysis, to better examine similarities between
groups of organisms and thus they can be grouped more precisely.
The main components of classification:
Taxonomic hierarchy: Organisms are classified into hierarchical groups, including Domain, Kingdom,
Phylum, Class, Order, Family, Genus, and Species. Taxonomy is the main method of classification and
helps to better organize all forms life live based on shared characteristics.
Binomial nomenclature: A universal naming system where each species is given a two-part name:
Genus (capitalized) and species (lowercase). This system was developed by Carl Linnaeus and
ensures that each species has a unique and standardized name.
Cladistics: A method of classification that groups species based on common ancestry and
evolutionary traits. It uses cladograms to illustrate evolutionary relationships and shared
characteristics.
2
