Virus and spyware definitions are files that act like an encyclopedia of known malicious software, including viruses, spyware, and other potentially unwanted software.
Highly accurate DNA parental testing became available in the 1980s with the development of RFLP. In the 1990s, PCR, developed in 1983, became the standard method for DNA parental testing. A simpler, faster, and more accurate method of testing than RFLP, it has an exclusion rate of 99.99% or higher.
Thus, the close association of DNA with chromosomes strongly implicatesDNA as the genetic material. DNA CAN GENETICALLY TRANSFORM CELLS The first unambiguous evidence that DNA was the hereditary material came from Frederick Griffithâsstudies in 1928. Griffith used chemical mutagens to isolate a nonvirulent form of the bacterium that causespneumonia, Diplococcus pneumoniae.