Final answer:
A Bayesian outgroup probability of 90% indicates confidence in a phylogeny, while 70% or less suggests caution should be exercised due to potential inaccuracies in depicting phylogenetic relationships.
Step-by-step explanation:
When evaluating phylogenetic trees, Bayesian outgroup probabilities can give us confidence in the tree's accuracy. If the Bayesian outgroup probability is 90%, then we can have confidence in the phylogeny provided by the tree.
However, if this probability is 70% or less, it suggests that we should be cautionary about the accuracy of the phylogenetic relationships depicted. Statistical algorithms help in assessing DNA segment similarity and when coupled with morphological data, they provide a more accurate depiction of an organism's phylogeny.