1.2 DNA iS the genetic material Avirulent mutants of a virus have lost the capacity to Infect a host cell productively, that is, to make more virus Transfection of eukaryotic cells is the acquisition of new genetic markers by incorporation of added DNA Transforming principle is DNA that is taken up by a bacterium and whose expression then changes the properties of the recipient cell 消当Avirulent mutants of a virus have lost the capacity to infect a host cell productively, that is, to make more virus. Transfection of eukaryotic cells is the acquisition of new genetic markers by incorporation of added DNA. Transforming principle is DNA that is taken up by a bacterium and whose expression then changes the properties of the recipient cell. 1.2 DNA is the genetic material