Words similar to presence-absence
Example sentences for: presence-absence
How can you use “presence-absence” in a sentence? Here are some example sentences to help you improve your vocabulary:
Probably the most obvious of such characteristics is the presence-absence of representatives of the analyzed species in orthologous groups of genes, and recently, at least three groups have employed this approach to build genome trees, primarily for prokaryotes [ 8 9 10 ] . An alternative way to construct a genome tree involves using the mean or median level of similarity among all detectable pairs of orthologs as the measure of the evolutionary distance between species [ 11 ] . Yet another possibility involves building species trees by comparing gene orders.
The topology of the tree based on gene pair conservation seems to carry a stronger phylogenetic signal than the gene presence-absence tree because it correctly groups together related free-living and parasitic bacteria despite major differences in gene repertoires (Fig.
The information on orthologous genes in prokaryotic genomes and the yeast genome was derived from the COGs as in the previous approach, and the orthology data were similarly represented as a 0/1 matrix of presence-absence of the analyzed genomes in the COGs.
Here, we compare the topologies produced with five, largely independent approaches to genome-tree building: i) presence-absence of genomes in Clusters of Orthologous Groups of proteins (COGs); ii) conservation of local gene order (pairs of adjacent genes) among prokaryotic genomes; iii) distribution of percent identity between apparent orthologs; iv) sequence conservation in concatenated alignments of ribosomal proteins; v) comparative analysis of multiple trees reconstructed for representative protein families.
volcanium ), a 0/1 matrix analogous to the one used for the presence-absence of individual genes was constructed, and a tree was built using Dollo parsimony [ 38 ] . A parsimony method was chosen for this analysis because the presence-absence of a conserved gene pair in a genome can be naturally treated in terms of character states.
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