RESUMO
Determination of sex is useful in Forensic Medicine. Barr bodies can be seen hair root sheath cells. The presence of barr bodies indicates that sex of the person is female. They are inactive X chromosome. The Barr bodies are also known as sex chromatin. Hair can present in the crime scene. Hair is trace evidence. The stain used was aceto-orcein. The percentage of barr bodies was found to be 28-49 %. The study was carried out for eight months and it was found that barr bodies persisted for eight months. It can be present anywhere at the crime scene. Hair of the accused can be present in hands of victim due to cadaveric spasm. Hair of victim can be found on the clothes of the accused. There is average fall in percentage of barr bodies with the passage of time due to the start of decomposition changes in the root sheath cells.