Given that these trees differ in topology and their depiction of relationship, i

Question

Given that these trees differ in topology and their depiction of relationship, it begets a very important question- Which of these topologies represents the "right" phylogeny? The truth is all of them are equally valid and could be presented as the phylogeny of the group. It is not due to a flaw in the data or analysis - it is due to incongruence among characters and the messy" nature of evolution. Generally we do not arbitrarily designate one particular tree as correct since it is based on the limitation of the data we have. The only exception to this is if there is other independent data suggesting a particular relationship. We generally present the phylogeny depicting only that which fully supported by the data we have. Thus we compute a "consensus tree" which is a summary of the individual MPTs depicting only those relationships supported by all analyses. Calculate a consensus tree using the same procedure you used for the morphological data. Try making both a Majority- Rule Consensus and a Strict Consensus. Make sure that you reroot the tree with taxon 6. Append these two trees to the end of this worksheet when you turn it in. What difference do you notice between the two consensus trees? Which one is the most conservative in terms of expressing differences in relationship?

Explanation / Answer

First tree is is strictly consensus tree. It include all those full splits that are present in all fundamentals trees whereas tree generated by majortiy rule include those splits that is present in greater then 50 percent of the trees that are fundamental.hence, first one is more conservative.

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