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DNA is the most preferred genetic material in most living organisms. RNA acts as a genetic metrial in some viruses like QB bacteriophage. 

DNA cannot directly code for any protein. The DNA initially helps in synthesis of RNA by the process of transcription and then RNA forms proteins by the process of translation.

Protein synthesizing machinery has evolved around RNA.

DNA being more stable is preferred for storage of genetic information. For the transmission of genetic information, RNA is better.