In which components of the body can DNA be detected for identification purposes?

• A. Only in blood
• B. In hair, bone, and any body tissue containing cells
• C. Only in skin samples
• D. Only in saliva

Answer: (B)

DNA can be detected in a variety of biological materials, which is crucial for identification purposes. It is present in hair (specifically within the hair follicle), bone, and any body tissue that contains cells. Blood is a well-known source of DNA, but tissues like muscle, organs, and even some cell types in the skin are also viable sources. Additionally, DNA can be isolated from various body fluids, including saliva and sweat. The versatility of DNA presence across different tissues makes it an invaluable tool in forensic science for identifying individuals based on biological samples collected from crime scenes, medical investigations, or ancestral research. This capability underscores the importance of using a wide array of biological sources for DNA analysis rather than limiting the search to just one or two types.