This thesis combines the use of standard bioinformatics analyses with the development of new computational techniques to study the evolution and genetic diversity of picornaviruses and nidoviruses.... Show moreThis thesis combines the use of standard bioinformatics analyses with the development of new computational techniques to study the evolution and genetic diversity of picornaviruses and nidoviruses. It integrates two lines of research __ genetics-based virus classification and evolutionary dynamics of gene length __ and aims at unveiling commonalities in the biology of these and other RNA viruses as well as assisting applied research in virology. Show less