Chapter 17: The Tree of Life

Systema Naturae

Browsable English translation of Linneaus’ Systema Naturea, or a General System of Nature

http://books.google.com/ebooks/reader?id=I3YZAAAAYAAJ&printsec=frontcover&output=reader

(Main Idea: Linnaeus’ classification system has seven levels.)

Cladograms

Interactive cladogram of living things including links showing how to read cladograms

http://www.amnh.org/ology/features/treeoflife/pages/cladogram.php

http://www.amnh.org/ology/features/treeoflife/pages/cladogram.php

(Main Idea: Cladistics is classification based on common ancestry.)

How Cladograms Are Built

Interactive tutorial in which you build a cladogram and learn about the tools that reveal relationships among organisms

 

http://www.pbs.org/wgbh/evolution/change/family/

(Main Idea: Cladistics is classification based on common ancestry.)

Molecular Evidence for Relationships

Video explaining how genetic data are used to determine relatedness

http://www.learner.org/courses/biology/archive/animations/hires/a_compev3_h.html

(Main Idea: Molecular evidence reveals species’ relatedness.)

Molecular Clock

Program in which you type in any two species and find out how long ago scientists estimate they diverged

http://timetree.org/

http://timetree.org/

(Main Idea: Molecular clocks use mutations to estimate evolutionary time.)

Tree of Life

Interactive ongoing Tree of Life project, in which clicking on a group reveals its subgroups; you can find humans buried in the tree and get a sense of just how diverse life is

http://tolweb.org/tree/phylogeny.html

http://tolweb.org/tree/phylogeny.html

(Main Ideas: Classification is always a work in progress. The three domains in the tree of life are Bacteria, Archaea, and Eukarya.)