Download Chapter18 Section01 edit

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

Document related concepts
no text concepts found
Transcript
18-1 Finding Order in
Diversity
Slide
1 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
18-1 Finding Order in Diversity
Natural selection and other processes have
led to a staggering diversity of organisms.
Biologists have identified and named about
9 million species so far.
They estimate that 2–100 million additional
species have yet to be discovered.
Slide
2 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Why Classify?
Why Classify?
To study the diversity of life, biologists
use a classification system to name
organisms and group them in a logical
manner.
Slide
3 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Why Classify?
In the discipline of taxonomy, scientists classify
organisms and assign each organism a universally
accepted name.
Slide
4 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Assigning Scientific Names
Assigning Scientific Names
Common names of organisms vary, so scientists
assign one name for each species.
Always in Latin.
Genus species
Homo sapiens
Slide
5 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Assigning Scientific Names
Carolus Linneaus developed a naming system
called binomial nomenclature.
In binomial nomenclature, each species is
assigned a two-part scientific name.
The scientific name is italicized.
Canis familiaris
Felis catus
Copyright Pearson Prentice Hall
Slide
6 of 26
End Show
18-1 Finding Order in Diversity
Linnaeus’s System of
Classification
Linnaeus's System of Classification
Linnaeus not only named species, he also grouped
them into categories.
What is Linneaus’s system of
classification?
Slide
7 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Linnaeus's System of
Classification
Linnaeus's seven levels of classification
are—from smallest to largest—
• species
• genus
• family
• order
• class
• phylum
• kingdom
Slide
8 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Linnaeus's System of
Classification
Each level is called a taxon, or taxonomic category.
Species and genus are the two smallest categories.
Grizzly
bear
Black
bear
Slide
9 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Linnaeus's System of
Classification
Genera that share many characteristics are grouped
in a larger category, the family.
Grizzly
bear
Black
bear
Giant
panda
Slide
10 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Linnaeus's System of
Classification
An order is a broad category composed of similar
families.
Grizzly
bear
Black
bear
Giant
panda
Red
fox
Slide
11 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Linnaeus's System of Classificat
The next larger category, the class, is composed of
similar orders.
Grizzly
bear
Black
bear
Giant
panda
Red
fox
Abert
squirrel
Class Mammalia
Slide
12 of 26
Copyright Pearson Prentice Hall
End Show
Linnaeus's System of
Classification
18-1 Finding Order in Diversity
Several different classes make up a phylum.
Grizzly
bear
Black
bear
Giant
panda
PHYLUM
Red
fox
Abert
squirrel
Coral
snake
Chordata
Slide
13 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Linnaeus's System of
Classification
The kingdom is the largest and most inclusive of
Linnaeus's taxonomic categories.
Grizzly
bear
Black
bear
Giant
panda
Red
fox
Abert
squirrel
Coral
snake
Sea
star
KINGDOM Animalia
Slide
14 of 26
Copyright Pearson Prentice Hall
End Show
18-1 Finding Order in Diversity
Grizzly Black Giant
bear
bear panda
Linnaeus's System of
Classification
Coral Sea
Red Abert
fox squirrel snake star
Slide
15 of 26
Copyright Pearson Prentice Hall
End Show
Related documents