BIO 3122 Lecture Notes - Lecture 6: Archaeopteryx, Polyploid, Adaptationism
23 Jan 2018
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Document Summary
Phylogenies are hypotheses based on the best available evidence: phylogenies help scientists identify questions that can be tested with additional evidence, phylogenetic inference is a rapidly changing field an entire sub discipline of computational biology has emerged. Phylogenies generate hypothesis": this shows a rough phylogeny, polytomy at bottom and missing link for tetrapods, used this phylogeny that if there was fossil evidence, it would have gone extinct at some point in the. Devonian so searched the canada"s arctic for devonian fossils. Scientists predicted where transitional fossils would be found: Searched mid-devonian rocks on ellesmere island, in the canadian arctic: appropriate age and habitat. The tiktaalik forelimbs share more homologies with tetrapods: had more insight into the transitions on land, pieced together how the tetrapod traits appeared over time. Shared more homologies with tetrapods than with coelacanths. Phylogenies reveal how tetrapod traits evolved over time. Phylogenies illustrate relationships among known species not all species.
