1 (1)ghhhgjhghjgjghgjhjhjhjhjhjhjhjh.ppt

gfgfghfhh

1. Diversity of Life:
Introduction to
Biological
Classification
By Deanne Erdmann, MS
BioEd Online

2. Why Do We Classify Organisms?

Biologists group organisms to represent
similarities and proposed relationships.

Classification systems change with
expanding knowledge about new and
well-known organisms.
Tacitus bellus
BioEd Online

3. Leucaena leucocephala
Lead tree
Classification

Binomial Nomenclature

Two part name (Genus, species)

Hierarchical Classification

Seven Taxonomic Catagroies

Systematics

Study of the evolution of biological diversity
BioEd Online

4. Carolus von Linnaeus
(1707-1778)
Swedish scientist who laid
the foundation for modern
taxonomy
Binomial Nomenclature

Carolus von Linnaeus

Two-word naming system

Genus

Noun, Capitalized,
Underlined or Italicized

Species

Descriptive, Lower Case,
Underlined or Italicized
BioEd Online

5. Hierarchical Classification

Taxonomic categories

Kingdom King

Phylum Philip

Class Came

Order Over

Family For

Genus Green

Species Soup
BioEd Online

6. Kingdoms and Domains
Bacteria Archaea Eukarya
Bacteria Archaea Protista Plantae Fungi Animalia
Monera Protista Plantae Fungi Animalia
The three-domain system
The six-kingdom system
The traditional five-kingdom system
BioEd Online

7. Systematics:
Evolutionary Classification of Organisms

Systematics is the study of the evolution of biological
diversity, and combines data from the following areas.

Fossil record

Comparative homologies

Cladistics

Comparative sequencing of DNA/RNA among
organisms

Molecular clocks
BioEd Online

8. Taxonomic Diagrams
Mammals Turtles Lizards and
Snakes
Crocodiles Birds Mammals Turtles Lizards and
Snakes
Crocodiles Birds
CladogramPhylogenetic
Tree
BioEd Online

9. Dichotomous Keys Identify Organisms

Dichotomous keys versus evolutionary classification

Dichotomous keys contain pairs of contrasting
descriptions.

After each description, the key directs the user to
another pair of descriptions or identifies the organism.
Example:
1. a) Is the leaf simple? Go to 2
b) Is the leaf compound? Go to 3
2. a) Are margins of the leaf jagged? Go to 4
b) Are margins of the leaf smooth? Go to 5
BioEd Online

10. Thank You

This concludes a brief review of biological
classification.

You may find additional information on this section of
in the expanded content talks and in the notes below
each slide in the slide library.
BioEd Online