The genetic material in viruses that infect bacteria is usually

Solution:

Viruses that infect bacteria are called bacteriophages. While viruses can have various types of genetic material (dsDNA, ssDNA, dsRNA, ssRNA), many common bacteriophages, such as the T-even phages (e.g., T2, T4), typically possess double-stranded DNA (dsDNA) as their genetic material. Therefore, dsDNA is usually the genetic material in viruses that infect bacteria.