Tree Counts Unrooted binary trees
4 taxa → 3 distinct trees
A tree with n taxa has n-2 inner nodes
And 2n-3 branches
Rooted binary trees
4 taxa → 3 unrooted trees * 5 branches each (rooting points) = 15 trees
n-1 inner nodes 2n-2 branches
The number of rooted trees for n taxa simply is the number of unrooted trees for n 1 taxa
The additional (n 1th) taxon represents all possible rootings for the # of unrooted trees with n taxa
#MolecularClock #GeneCkock #evolutionaryClock #PrincipleOfParsimony #phylogenicTree #outgroups #ingroup #Homology #Homoplasy #cladogram #Phylogram #domain #kingdom #phylum #Class #genus #ScientificNames #taxonomicHierarchy #species #phyliogeneticTree #Evolution #speciation #diagram #branchingInAPhylogeneticTree #Genetics #bilology #taxonomy #populationGenetics #hawaiiIslands #founderEffect #geneticDrift #geneticVariation #taxa #clade #Paraphyletic
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