There are two diagnosed types of hemophilia, known as Hemophilia A and Hemophilia B. Hemophilia A is an X-linked recessive trait, found on the X chromosome. Because the defective trait is found on the X chromosome, it is easier for women to overcome the disease. One of the two X chromosomes in a females body acts as a backup just in case one of the chromosomes is affected by the defective trait. Therefore, hemophilia is more common in males. Hemophilia B is caused by an X-linked recessive trait. It is not as simple for men to overcome the defective gene, because they only have 1 X chromosome. If a male were to be affected by the defective trait, it is more than likely that hemophilia will be present in that persons body. The defects on certain chromosomes are what causes the missing clotting factor in a persons body.