When a dominant gene occurs on the X chromosome, both males and females can show symptoms of a condition with only one copy of the gene present. However, males who have only one X chromosome often have a more severe presentation of the condition than females who have two copies of the X chromosome. With this type of inheritance females have a 50% chance of inheriting the condition from their mother and a 100% chance of inheriting the condition from their father. Males have a 50% chance of inheriting the condition from their mother. There is no father-to-son transmission of X-linked dominant inheritance.