The production of a virus with a phenotype that does not match its genotype. During the assembly of a virus, nucleic acid and protein components are drawn randomly from two pools. In a host infected simultaneously by mutant and wild-type viruses, progeny phages are assembled without regard to matching the coat components to the genes in the nucleic acid core. Thus, discrepancies sometimes arise, and a virus is produced with coat proteins that are not specified by its genome. See pseudovirion, reassortant virus.
Subjects: Genetics and Genomics.