Classification

I normally begin the very short unit on classification after genetics and evolution because of the changes in how organisms have been organized with DNA and biochemical evidence now available.

I start off giving a bit of history on the classification of organisms and Carolus Linnaeus.  Then I talk about taxonomy and scientists' current understandings and classification system using the domains Bacteria, Archaea, and Eukarya.

I have my classes practices creating a dichotomous key and I give some additional information about binomial nomenclature.

Students complete several classroom activities and labs to practice following and writing dichotomous keys and learn more about the classification of organisms.  I follow with examples of phylogenetic trees and cladograms that show the evolutionary history of animals.  Videos about the evolution of vertebrate diversity (below) are shared with students as I wrap up the unit.

The Presentation and Student Notes files are available here.