BIOL 1001 Lecture Notes - Lecture 20: Phylocode, Barcode, Radiometric Dating
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Biol (cid:1005)(cid:1004)(cid:1004)(cid:1005) lecture (cid:1006)(cid:1004): ta(cid:454)o(cid:374)o(cid:373)(cid:455) a(cid:374)d the tree of life. The tree of life is divided into three great clades called domains; bacteria, eukaryotes and archaea. The early history of these domains is not yet clear. Interchanges of genes between clades (horizontal gene transfer). This can occur by viral infection, plasmids, prokaryotic tra(cid:374)sfor(cid:373)atio(cid:374) (cid:894)uptake of (cid:862)(cid:374)aked(cid:863) dna(cid:895) a(cid:374)d fusio(cid:374) of orga(cid:374)is(cid:373) (cid:894)e(cid:454). The ring of life accounts for horizontal gene transfers early in the history of life and is alternative for the tree of life. Molecular data are providing new information changing the tree of life every now and then. History of taxonomic classification; original linnaean system; two kingdoms. Linnaeus separated these groups into plants and animals. Anything not an animal was classified a plant. Pla(cid:374)ts: do(cid:374)"t (cid:373)o(cid:448)e, eat, (cid:374)e(cid:448)er stop gro(cid:449)i(cid:374)g (cid:894)i(cid:374)deter(cid:373)i(cid:374)ate gro(cid:449)th(cid:895) Animals: move, eat, stop growing when they reach a certain size (determinate growth)
