  Dendrograms are a way to represent evolutionary relationships between
organisms. Nowadays, these are inferred based on the comparison of genes or
protein sequences by taking into account their differences and similarities.
The genetic material of choice for the sequence alignments (all the genes or
sets of genes) results in distinct inferred dendrograms. In this work, we
evaluate differences between dendrograms reconstructed with different
methodologies and obtained for different sets of organisms chosen at random
from a much larger set. A statistical analysis is performed in order to
estimate the fluctuation between the results obtained from the different
methodologies. This analysis permit us to validate a systematic approach, based
on the comparison of the organisms' metabolic networks for inferring
dendrograms. It has the advantage that it allows the comparison of organisms
very far away in the evolutionary tree even if they have no known ortholog gene
in common.
