BIOL 1001 Lecture Notes - Lecture 4: Biogeography, Selective Breeding
28 Jan 2017
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Evidence of evolution: theory of evolution by natural selection. I(cid:374)di(cid:448)iduals (cid:449)ith (cid:272)ertai(cid:374) herita(cid:271)le traits produ(cid:272)e (cid:373)ore offspri(cid:374)g"s tha(cid:374) those without those traits. Lineages: sequences of species that form line of descent. A phylogeny is a hypothesis which is constantly tested & re-evaluated. Phylogenies are reconstructed from many sources of data. Phylogeny of vertebrates- dots indicate where each trait arose (speciation event) As you go up tree it goes from recent to past. Phylogenies help us depict the unity & diversity of life. Fossils-> extinction; extinct species resembling extant species. Fossils-> transitional fossils, the appearance of new forms & the disappearance of old forms are bound together. Homology- structural development, genetic (compare anatomy, embryology & dna analysis, includes vegestial traits) Burial, low rate decomposition, mineralization depending on type of fossil. Water carries rocks & particles into lakes which buries dead organisms by layers of sediments which forms new rocks. The preserved remains may later be discovered & studied.
