Why do we classify things?  Grouping things helps us to understand them better.  o A phone book  o A dictionary  o A store.

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Classification of Living Things

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Classification of Living Things

Presentation transcript:

Why do we classify things?  Grouping things helps us to understand them better.  o A phone book  o A dictionary  o A store

Classification vs Taxonomy  Classification: putting things into orderly groups based on similar characteristics  Taxonomy: the science of describing, naming, and classifying organisms The Evidence used to classify into taxon groups - Embryology - Chromosomes / DNA - Biochemistry - Physiology - Evolution - Behavior

Early classification  Aristotle grouped everything into simple groups such as animals or plants  He then grouped animals according to if they had blood or didn’t have blood, and if they had live young or laid eggs, and so on…

Binomial Nomenclature  Developed by Carolus Linnaeus  Swedish Biologist 1700’s  Two-name system  Genus and species named using Latin or Greek words

Rules used to write scientific names Homo sapiens  An organism’s genus is always written first; the organism’s species is always written second  The genus is Capitalized; the species is written in lower case  Scientific names of organisms are always italicized or underlined

The modern system of classification has 8 levels:  Domain -Eukaryote (Bacteria/Archaea) -Prokaryote  Kingdom  Phylum  Class  Order  Family  Genus  Species

Helpful way to remember the 8 levels  Kids playing catch on freeways get squashed  Katy please come over for ginger snaps.  Kids prefer cheese over fried green spinach.  King Phillip called out for good soup.  King Philip can only farm green spinach.  Kenneth, please close our front gate soon.  Keep plates clean or family gets sick. Or…make up your own… K P C O F G S

The classification of humans – Homo sapiens The two part naming system is called Binomial nomenclature (consists of genus and species.). Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Primata Family: Hominadae Genus: Homo Species: sapiens (note: species is not capitalized.)

Using the Classification System Cladogram Analysis -it is a diagram that depicts evolutionary relationships among groups Taxonomic Key (Dichotomous Key) -paired statements that describe the physical characteristics of different organisms Gel Electrophoresis -a type of DNA analysis that can be used to determine how closely living organisms are related to one another based on their DNA

Taxonomic Key  1a Fruits occur singly Go to 3  1b Fruits occur in clusters of two or more Go to 2  2a Fruits are round Grapes  2b Fruits are elongate Bananas  3a Thick skin that separates easily from flesh Oranges  3b Thin skin that adheres to flesh Go to 4  4a More than one seed per fruit Apples  4b One seed per fruit Go to 5  5a Skin covered with fuzz Peaches  5b Skin smooth, without fuzz Plums What steps would you use to identify an apple?