chapter 18: taxonomy taxonomy: the discipline where scientists classify organisms and assign...

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Chapter 18: Taxonomy Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism.

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Page 1: Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism

Chapter 18: TaxonomyChapter 18: Taxonomy

Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism.

Page 2: Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism

I. Aristotle- 384-322 B.C.A. Devised “classical” system that lasted 2,000 years. “Scala naturae”= “great chain of being” plants man

A. Aristotle’s system had 2 Kingdoms.

1. Plant Kingdom

(trees, shrubs, herbs)

2. Animal Kingdom

(land, sea, air)

Page 3: Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism

II. Carolus Linnaeus- botanist who lived in 18th Century. Developed binomial nomenclature system of naming; 7 category system of classification.

A. Problems with common names1. Misnomers

Ex. Jellyfish, silverfish, starfish, goldfish, crayfish

2. Variation in names among languages and regions (localities)

Ex. Cougar, puma, mountain lion

Page 4: Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism

Jellyfish

Starfish

Silverfish

Crayfish

Only true fish…

Goldfish!

Page 5: Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism
Page 6: Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism

B. Developed scientific names1. Chose Latin: 18th Century scientists understood Latin.

2. Binomial nomenclature: Two-word naming system. 1st part: genus, 2nd part: species

A. Names based on1. Physical characteristics

Ex. Melanoleuca

2. BehaviorEx. Noctivagens

3. Honorary (for people- discoverer, someone of past significance )

4. Location and HabitatEx. Californica

Page 7: Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism

C. Categories of classification1. Kingdom

Phylum (Division)

Class

Order

Family

Genus

Species

AnimalChordate

MammalPrimate

HominidHomo

sapiensYou must know the full classification for a human!

Animal-Chordate-Mammal-Primate-Hominid-Homo-sapiens

Page 8: Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism

2. Genus species name is written in italics or underlined. Genus is capitalized, species is not.

Ex: Homo sapiens or Trifolium agarium

Page 9: Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism

III.Modern TaxonomyA. Classification is based on similarities

1. Structures (morphology)

2. Biochemical and genetics

3. Evolutionary relationships (phylogeny)

4. Embryology

5. Reproductive potential

a. species= organisms that are “reproductively isolated and produce fertile offspring.”

*not man-made

Page 10: Chapter 18: Taxonomy Taxonomy: the discipline where scientists classify organisms and assign universally accepted names to each organism

IV.Six Kingdom SystemA. Plants: multicellular, eukaryotic (true nucleus), stationary autotrophsB. Animals: multicellular, mobile, eukaryotic heterotrophsC. Fungi: stationary heterotrophs, eukaryotesD. Protists: unicellular eukaryotes Monera: unicellular prokaryotesE. Archaebacteria– used to be called MoneraF. Eubacteria– used to be called Monera