5 to 100 million species of organisms on earth. all organisms on earth are genetically related
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NSF Assembling the Tree of Life (ATOL) Program
http://atol.sdsc.edu
“Increased knowledge of phylogenetic relationships will improve human health, push the frontiers of comparative developmental biology, meet threats to agriculture and forestry from invasive species and pests, and improve management of our natural resources.”
Some content is provided by amateur contributors
> 6000
web pages with scientific content
> 200
treehouses (learning materials)
> 20,000
images, videos, audio files
The structure of the Tree of Life web site
illustrates phylogenetic relationshipsLife on Earth
Rosa davuricaBembidion zephyrum
Eukaryotes
Insects
Branch pages
Leaf pages
Homoplasy in Sequence Data:Long Branch Attraction
A
B C
D D
CB
A
Reconstructed TreeTrue Tree
many informative changes
fewinformative changes