Additionally, the arbitrary trend of reading a phylogenetic tree based on the relative position of the organisms across the tips of the trees (Halverson et al. [2011]) is reflected in how students justify the representations they generated.
The gyrB gene (encoding for gyrase B) sequence, used to identify M. tuberculosis complex member specific sequence single-nucleotide polymorphisms (SNPs) (6 ), identified the position of the organism as being situated between dassie bacillus and M. africanum subtype 1(a) and showed no detectable new SNPs.
These genes could either reflect the phylogenetic position of this organism as a basal lineage of the Firmicutes or were acquired by horizontal transfer events.
The types of cells and the signalling molecules taking part in this process are dependent on the evolutionary position of the organism [5].
Based on these observations and the phylogenetic position of each organism, a model of the evolution of the CRP/FNR-type TFs is proposed (fig. 9).
They do not fall into any of the TCGs that would be expected according to the phylogenetic position of the organism having the fusion.
bThe proteins were categorized into groups by considering primary structures and taxonomical positions of donor organisms.
The numbers of intron were highly variable in the diverse PHGPx genes, with a gross tendency to increase along with the taxonomical positions of donor organisms.
This is in contrast to the phylogenetic positions of these organisms: S. marinus and H. butylicus belong to the order Desulfurococcales, while T. pendens belongs to the order Thermoproteales.
Hence, morphology has become less significant in taxonomic and floristic studies, but detailed morphological (including ultrastructural) investigations can often help to interpret molecular results such as unusual phylogenetic positions of some organisms.
