Such women often have men (such as brothers and uncles) in the family who are sick, while women (such as sisters and aunts) are healthy. Hemophilia is a disease that only affects boys. With this disease, the blood does not clot easily due to the lack of a coagulation substance. Therefore, minor injuries will cause bleeding, and even without injuries, there will be subcutaneous and intra-articular bleeding. Once cerebral hemorrhage occurs, there is a fatal risk. Color blindness is also a genetic disease that only