EVOLUTION TREES:

Neighbor-joining consens tree:

In this evolution tree we can appreciate two big clusters, which are situated on the top and on the bottom of the tree. They correspond to the two genus of Coronaviridae family. The cluster that is on the top belongs to the genus Coronavirus, and the other belongs to the genus Torovirus.

Also, inside the Coronavirus cluster, we can observe two couples: Bovine and human coronavirus, and murine hepatitis virus and rat sialodacryoadenitis coronavirus.

The similarity of the members of these couples maybe is explained by the differences between their hosts, the first infects superior mammals, and the others rodents.

Besides these big clusters, we found Influenza C branch that are completely independent of the rest of the sequences. This can be explained because it belongs a different viruses family.

Parsimony consens tree:

In this tree, appear the same clusters than in the neighbor-joining analysis, but we can see a difference on the Murine hepatitis virus (the shortest) position, that changes from Coronavirus cluster to Torovirus group. This branch is few strange, because it puts together viruses that belong at different genus.

Influenza continues being independent as we hope after study NJ tree.

Maxim likelihood tree:

This tree looks very different than the others, but the clusters that we found are the same, and Influenza continues like an independent branch.

Inside the two clusters, we can’t analyze the relation between the organisms, because the branches are very short.