BIO152H5 Chapter Notes -Mitosis, Euryarchaeota, Harmful Algal Bloom
Document Summary
Bacteria and archaea i & ii 28. 1 -4. Phylogeny: the evolutionary history of a group of organisms (usually summarized and depicted in the form of a phylogenetic tree) A phylogenetic tree shows the ancestor-descendant relationships amongst popn or species, and clarifies who"s related to whom. A branch represents a popn through time. The point where two branches diverge is a node (or fork) and it represents the point in time when an ancestral group split into two or more descendant groups. A tip (or terminal node), the endpoint of a branch represents a group (a species or larger taxon) Two general strategies for using data to estimate trees: phonetic approach and cladistic approach. Phenetic approach: a method for constructing a phylogenetic tree by computing a statistic that summarizes the overall similarity among popns based on the available data. E. g. researchers might use gene sequences to compute an overall genetic distance" b/w two popns.
