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Lecture

BIO120H1 Lecture Notes - Atlantic Horseshoe Crab, Red Algae, Aequorea Victoria


Department
Biology
Course Code
BIO120H1
Professor
Dr.Arts

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LECTURE 4 CLASSIFYING THE DIVERSITY OF LIFE
Classifying Living Organisms
•Number of species known to science is approximately 1.8 million
•To name organisms, biologists use a multilevel grouping of individuals: classification
•Organisms were first classified more than 2,000 years ago by Aristotle
–Living things were either
plants or animals
Carolus Linnaeus (1707-1778)
The “father” of taxonomy
•Binomial nomenclature
•Hierarchical system of classification: large groups share general characteristics, and small
groups share many characteristics
kingdoms phyla classes orders families genera species
Higher Categories
•Taxonomists use a hierarchical system to classify organisms
Classifying the Diversity Life Different approaches to classifying living organisms
1.10 Three Domain System Bacteria - prokaryotes Archaea - prokaryotes Eukarya -
eukaryotes 2
Biological Classification: Domains and Kingdoms
Table 12.02
Bacteria and Archaea
• form two of the three domains of the tree of life
-are everywhere
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