viruse with both dna and rna as its genetic material?

Answer 1

Doesn't exist or at least hasn't been isolated yet.
Most common types are the following

1.single-stranded RNA: tobacco mosaic virus, bacteriophage R17, poliovirus
2.double-stranded RNA: Reovirus
3.single-stranded linear DNA:parvovirus
4.single-stranded circular DNA: M13 and φX174 bacteriophages
5.double-stranded circular DNA: SV40 and papyloma viruses
6.double-stranded linear DNA: T4 bacteriophage, herpes virus
7.double-stranded linear DNA with covalently linked terminal protein: adenovirus
8.double-stranded linear DNA with covalently sealed ends: poxvirus

Answer 2

Viruses having both dna and rna does't exist b'cozgenetic material can only b of 1 kind

Answer 3

a virus remains inactive until it attaches itself to and infects a host cells, in this case attaches itself to DNA of a host cell, which makes it a viral DNA, at some point of time the viral DNA extracts itself from the host and follows a second path, in this cycle the virus attaches itself to the surface of the host cell, it makes a hole in the cell membrane and injects DNA or RNA and then the virus is left outside the cell, so in other words DNA and RNA has its owe genetic material and it follows different paths.