Microbial Phylogeny and Evolution: Concepts and by Jan Sapp

By Jan Sapp

The start of bacterial genomics because the mid-1990s introduced withit numerous conceptual transformations and completely new controversies. operating past the scope of the neo-Darwinian evolutionary synthesis, a bunch of major microbial evolutionists addresses the subsequent and comparable matters, usually with markedly assorted viewpoints: · Did the eukaryotic nucleus, cytoskeleton and cilia additionally orginate from symbiosis? · Do the present eventualities approximately he starting place of mitochondria and plastids require revision? · what's the quantity of lateral gene move (between "species") between micro organism? · Does the rDNA phylogenetic tree nonetheless stand within the age of genomics? · Is the process the 1st three billion years of evolution even knowable?

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On the basis of “agreed usage,” the green flagellates from which plants were thought to have descended, as were the bacteria, were the domain of botanists, and the colorless flagellata—the protozoa, Heliozoa, Foraminifera, and Infusoria—were the subject of zoologists. By the third decade of the twentieth century, some botanists expressed the opinion that the Schizophyta or Monera did not belong in the plant kingdom. ”19 Copeland reassured botanists that botany was “still the most convenient place to study them,” but added that, “It is however, very important that common sense, consistency, reasonableness never be ignored.

The former looked for similarities and differences between genera and species, yet for practical purposes, the characters that would not rank as species characters by systematists could be of paramount importance. Consider the pathologists or medical bacteriologists treating patients by the administration of an antiserum. The pathologists and bacteriologists must know the extent of type specificity exhibited by the pathogen. Two bacteria may be morphologically and culturally identical and, for phylogenetic reasons, placed in the same species.

His emphasis on physiology resulted in a new nomenclature that was simple and rational. Various genera were designated by names that concisely described the physiological and morphological properties of the organisms. Though received with circumspection and criticism, Orla-Jensen’s scheme was highly influential. Those who applauded it thought it was high time that the diverse physiological traits played an important role in classification, because that is how bacteria have attained their most remarkable diversity.

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