The tips of a phylogenetic tree can be living taxa or fossils, and represent the “end“ or the present time in an evolutionary lineage. A phylogenetic diagram can be rooted or unrooted. A rooted tree diagram indicates the hypothetical common ancestor of the tree. An unrooted tree diagram (a network) makes no assumption about the ancestral line, and does not show the origin or “root“ of the taxa in question or the direction of inferred evolutionary transformations.
In addition to their use for inferring phylogenetic patterns among taxa, phylogenetic analyses are often employed to represent relationships among genes or individual organisms. Such uses have become central to understanding biodiversity, evolution, ecology, and genomes. In February 2021, scientists reported sequencing DNA from a mammoth that was over a million years old, the oldest DNA sequenced to date.
Phylogenetics is part of systematics.
Taxonomy is the identification, naming and classification of organisms. Classifications are now usually based on phylogenetic data, and many systematists contend that only monophyletic taxa should be recognized as named groups. The degree to which classification depends on inferred evolutionary history differs depending on the school of taxonomy: phenetics ignores phylogenetic speculation altogether, trying to represent the similarity between organisms instead; cladistics (phylogenetic systematics) tries to reflect phylogeny in its classifications by only recognizing groups based on shared, derived characters (synapomorphies); evolutionary taxonomy tries to take into account both the branching pattern and “degree of difference“ to find a compromise between them.
#phyliogeneticTree #Evolution #speciation #diagram #branchingInAPhylogeneticTree #Genetics #bilology #taxonomy #numericalTaxonomy #taxonomyOfAngiosperms #taxonomyClass11 #whatIsTaxonomy #taxonomyAndSystematicsClass11 #molecularTaxonomy
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