In general, medical writing tends to be as inclusive as possible. Remember that every sign, symptom, or finding is not found in every patient. Another source of information about IP is available at the Online Mendelian Inheritance in Man website. All the genetic information that we need is inherited from our parents. The majority of the genes are present as two copies, one of which we have received from each parent.
Recessive diseases show up only when both copies of a pair of genes are abnormal.
In dominant conditions, only one member of the pair needs to be abnormal for the disease to occur. Perhaps the most commonly known X-linked disease is a muscle disorder called Duchenne Muscular Dystrophy. This recessive X-linked disease affects only males. IP is a dominant X-linked condition . This means that females with only one copy of the abnormal gene will show the disease, even though they have a normal gene on their other X-chromosome.