1. DNA (Deoxyribonucleic acid): This is the primary source of genetic information in most organisms. It contains the instructions for building and maintaining an organism, passed down from parents to offspring.

2. RNA (Ribonucleic acid): While not the primary source, RNA plays a crucial role in translating the genetic code from DNA into proteins, which carry out essential functions in the body. RNA can also act as a genetic carrier in some viruses (like retroviruses).

It's important to note that viruses can also carry genetic information, but they are not considered "organisms" in the traditional sense. They require a host cell to reproduce and are not capable of independent life.