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Consequently, these viruses are mentioned to have “segmented” genomes. In these viruses, the virion itself accommodates an entire set of enzymes that can make the most of the minus strand of the genomic RNA as a template for synthesis of mRNA in the test tube as well as in the cell cytoplasm after infection. A variety of important studies have used class III viruses as a supply of pure mRNA. All the animal viruses belonging to courses III – VI have RNA genomes.
In some cases the product is extra of a rearrangement of genomic parts—known as pseudo-recombination. The Western Equine Encephalovirus is a known instance of this final category. Although there isn’t a detailed catalogue of the evolutionary relationships of viruses and hosts, sure general characterizations can be made. In such viral groups as poxviruses, papillomaviruses, and …