A viral genome fragmented into two or more nucleic acid molecules. For example, the alfalfa mosaic virus has four different RNA segments, each packaged in a different virion. Successful infection requires that at least one RNA of each type enters the cell. Such a virus is said to be heterocapsidic. If all fragments of a segmented genome are present in the same virion (e.g., influenza virus), the virus is said to be isocapsidic.
Subjects: Genetics and Genomics.