BILD 3 Lecture Notes - Lecture 1: Treemapping, Synapomorphy, Convergent Evolution
20 Oct 2016
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Can make tweaks to these hypotheses since we have not gone back in time. Macroevolution - any evolutionary change at or above the level of species. Pedigree trees: time axis and different species axis (phylogenic) What the tree represents is speciation events where a single node represents a population that speciates into two different species. Phylogeny: hypothesis of the evolutionary history of a species or group of related species. Hypotheses are usually written and testable (collected data to determine sequence of events) Systematics: classifies organisms and determines their evolutionary relationships. Axis from base of the tree to the tips always represents time. Each node represents the common ancestor of all descendants. To find common ancestor of any group of organisms, just trace form living organisms toward the base - where they all meet is the ancestor. Sister taxa - 2 taxa that derive from an immediate common ancestor, each other"s closest relative.
