Can modern phylogeny-based taxonomic systems ever produce a satisfactory phylogenetic tree based on DNA

Phylogenetic (evolutionary) Tree

showing the evolutionary relationships among various biological species or other entities that are believed to have a common ancestor.

• Each node is called a taxonomic unit.

• Internal nodes are generally called hypothetical

taxonomic units

• In a phylogenetic tree, each node with

descendants represents the most recent

common ancestor of the descendants, and the

• edge lengths (if present) correspond to time

estimates.

Explanation:

Phylogenetic trees are usually based on morphological or genetic homology. A comparison of anatomical traits can reveal an evolutionary relationship among species. Taxonomy, the science of classifying organisms, is based on phylogeny. Early taxonomic systems had no theoretical basis; organisms were grouped according to apparent similarity.