Choice of metaphor: tree, a net, cobweb, or ring In his article Uprooting the Tree of Life, W. Ford Doolittle discusses the Last Universal Common Ancestor – the root of the Tree of Life – and the problems with that concept posed by HGT. He describes the microorganism Archaeoglobus fulgidus as an anomaly with respect to a phylogenetic tree based upon the code for the enzyme HMGCoA reductase – the organism is definitely an archaean, with all the cell lipids and transcription machinery expected of an archaean, but its HMGCoA genes are of bacterial origin. In the article, Doolittle says that while it is now widely accepted that mitochondria in eukaryotes derived from alpha-proteobacterial cells and that chloroplasts came from ingested cyanobacteria,
Choice of Metaphor: Tree, Net, Cobweb, or Ring In his article Uprooting the Tree of Life, W. Ford Doolittle discusses the Last Universal Common Ancestor – the root of the Tree of Life – and the problems with that concept posed by HGT. He describes the microorganism Archaeoglobus fulgidus as an anomaly with respect to a phylogenetic tree based upon the code for the enzyme HMGCoA reductase – the organism is definitely an archaean, with all the cell lipids and transcription machinery expected of an archaean, but its HMGCoA genes are of bacterial origin. In the article, Doolittle says that while it is now widely accepted that mitochondria in eukaryotes derived from alpha-proteobacterial cells and that chloroplasts came from ingested cyanobacteria,
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metaphor: tree, a net, cobweb, or ring
Metaphor: Tree, Net, Cobweb, or Ring