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The world of animal viruses appears to offer unfathomable diversity of specimens but, as molecular biology of the replication of many has been studied, a pattern of behavior emerged. The viruses can be divided into, each of which has its own method of its genetic information from one to the next and its own style of expressing genetic information. Although in cases the data are still fragmentary it is to outline the behavior of these systems to place them in a formal scheme. In this I will present such a scheme and I will in some detail the behavior of three viral which have been investigated in my. Furthermore, I will discuss some of implications of the existence of these viral in the context of the behavior of normal.
David Baltimore (1971) studied this question.