Nuclear Tree: Focus on the relationships (monophyly, sister groups, etc…). Address things that look different group1 outg oatgroup2 0.0 A Fa T pol s all Shala u-ba. H our seya Stri SLxig S.coy Snit Solution The phylogenetic tree is composed of tips, internal nodes and edges. The tips (leaves) of the phylogenetic tree represent current day species, groups of descendant taxa. Two descendants that split from the same node are called sister groups, each one is the closest relative of the other, they have a common ancestor that is unique to them, they have a lot of evolutionary history in common and very little evolutionary history that is unique to each one. In the given tree, so of the sis groups branches are not complete, or of different length, if they have a difference in length then they are not sister groups. Phylograms are phylogenetic trees in which the length of the edges represent evolutionary time; therefore clades in phylograms represent true evolutionary history. in the given tree it ssems it is a phylogram. but 0.02 represents length of branch that represents amount of genetic change. but is not given for other branches. Two differenet length of branches from sister groups are seen , which is unlikely to happen. One branch shows a straight vertical line , and two groups are formed, this is not defined in thr tree. Each clade different branch length so can not be defined clearly. Branch length of two outgroups are looks unusual..