Central dogma, proposed by Francis Crick states that the genetic information flows from DNA to RNA through transcription and from RNA to proteins through translation.
Yes, there are some exceptions to this process. In some viruses, the genetic material is in the form of RNA. In such cases, the direction of genetic information flow is reversed. The RNA is first converted into DNA through the process, reverse transcription. The DNA thus formed, follows the usual path of central dogma i.e. it first converts into RNA, which is then translated into proteins. An example of organism exhibiting reverse transcription is Influenza A virus
