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Document Summary

The evolutionary history of a group of species is called it phylogeny and a phylogenetic tree is a. Estimating evolutionary trees graphical summary of this history. An evolutionary tree describes the patter, and in some cases the timing, of events that occurred as species diversified. It also records the sequence in which lineages appeared and documents which organisms are more closely or distantly related.  they are shared, derived traits: any group that includes an ancestor and all of its descendants is called a monophyletic group (or clade or lineage)  this means all synapomorphies are homologous traits but not all homologous traits are synapomorphies.  read paragraph on this method of drawing phylogenetic trees y each branch on the tree corresponds to one or more synapomorphies that distinguish the derived groups. A phylogenetic tree inferred by clustering synapomorphies in this way is called a cladogram.

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