 Remember?
Kingdom, Phylum,
 Kingdom, Phylum, Class,
 Kingdom, Phylum, Class, Order,
 Kingdom, Phylum, Class, Order, Family,
 Kingdom, Phylum, Class, Order, Family, Genus,
 Kingdom, Phylum, Class, Order, Family, Genus,
Species
 Taxonomy classified living organisms by their physical
characteristics. That was all the scientists of the time
could see.
 Linneus divided living things into 2 kingdoms:
PLANTS AND ANIMALS
 After the invention of the microscope, it was quickly
determined that the physical characteristics we could
see were not enough to classify some organisms.
Scientists had to consider cellular differences and
molecular differences….. So
 Our classification of living things has expanded to
include cellular and molecular level differences
observed in the microscope and the laboratory.
 There are now 3 Domains and 6 Kingdoms!
SO WHAT ARE THE CURRENT DOMAIN AND
KINGDOMS?
Some look familiar; a few look new. Those darn bacteria
really did not fit in with plants or animals and had to
have their own domain!
Domain
Bacteria
Archaea
Kingdom
Eubacteria
Archaebacteria
Eukarya
Protist
Fungi
Plantae
Animalia
Examples
Streptocuccus, E. coli
Methanogens,
halophiles
Amoeba, Paramecium
slime molds
Mushrooms, yeasts
Mosses, ferns,
flowering plants
Sponges, insects, worms
fishes, mammals
 So the Domain is the most inclusive (least specific







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category),
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species
 So what do modern day scientists look at to group
organisms into particular categories?
 LOOKING AT
EXAMPLE
Outer characteristics
Hair vs scales
Inner characteristics
Backbone vs none
Cellular characteristics Nucleus vs none
Molecular
characteristics
Chromatin vs none
Here is an interesting thought
Science has come a long way even from the species
category to very specifically identify living things.
We are all humans, but other than physical
characteristics; hair color, height, etc. humans are
identified by
Fingerprints! AND even more specific ????
Our molecular structure instructions DNA
 Pick up a book from the room copy shelves
and begin WS 18-3. Read then answer
questions. Any you do not finish in class is
HW
 Read the Cytology Lab to become familiar
with the procedure. Lab starts on Tuesday.
 Your other HW assignment is Extra Credit
Flashcards of the Unit 3 Vocab. We have 1
section left, then it will be test time on Unit 3.
 Unit 3 test date = Monday November 12