Presentation on theme: "From Bacteria to Plants Chapter 1.2/1.3 Classifying Organisms."— Presentation transcript:
From Bacteria to Plants Chapter 1.2/1.3 Classifying Organisms
Do You Classify Objects? How would you classify the items in this classroom? Why would it be important to classify things?
Why Do Scientists Classify? Classification: ◦ grouping things based on their similarities. ◦ organize living things so organisms are easier to study Taxonomy: ◦ The study of how living things are classified.
Using the Classification System Taxonomic Key ◦ Series of paired statements ◦ Describe the physical characteristics of different organisms
Carolus Linnaeus ◦ placed organisms into groups based on observable features ◦ Named organisms with binomial nomenclature - a 2 part name 1 st word: Genus similar organisms Ex: Types of Cats 2 nd word: Species smaller groups Ex: Lions, Pumas, Housecats
Genus Species Example : Felis domesticus Genus Species Example : Felis domesticus Types of Cats House Cat
The 8 Levels of Classification Aristotle and Linnaeus invented today’s classification system in this order: ◦ Domain (Broadest) ◦ Kingdom ◦ Phylum ◦ Class ◦ Order ◦ Family ◦ Genus ◦ Species (Narrowest )
Charles Darwin’s Hypothesis: over time a species gradually changes- known as evolution Studied Finches 1. Finches flew from South America to the Galapagos islands 1. Adapted to the new environment 2. Reproduced 3. New generation changed slightly to survive in that environment Ex: different beaks 5. Finches changed to create new species
3 Domains of Life Organisms are placed in domains and kingdoms based on: 1. Cell type 2. Ability to make food 3. Number of cells in their body Bacteria -Prokaryotes -No nucleus -Harmful-strep -Helpful-yogurt Bacteria -Prokaryotes -No nucleus -Harmful-strep -Helpful-yogurt Archaea- -Prokaryotes -No nucleus -Different chemistry Archaea- -Prokaryotes -No nucleus -Different chemistry Eukarya- -Eukaryotes -Have nucleus -Protists -Fungi -Plants -Animals Eukarya- -Eukaryotes -Have nucleus -Protists -Fungi -Plants -Animals