Phylogenetic systematics is a method of classification based on the evolutionary history of organisms, dividing organisms into meaningful groups and subgroups. It was developed by Willi Hennig , an entomologist, in 1950, but was not well accepted until decades later. Evolution results in modifications of characteristics over time. A cladogram is a branching diagram that depicts species divergence from common ancestors. They show the distribution and origins of shared characteristics.
Cladograms are testable hypotheses of phylogenetic relationships.
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