The features of X linked inheritance are:

Males are all affected

Females only occasionally show mild signs of disease

Each son of a carrier a 1:2 chance of being affected

Each daughter of a carrier has a 1:2 risk of being a carrier

Daughters of affected males will all be carriers

Sons of affected males will be affected

X linked dominant (rare)

X linked Hypophosphataemic rickets von Willebrand's disease

X linked recessive

Becker’s muscular dystrophy Duchenne’s muscular dystrophy Fabry’s disease

Hunter’s syndrome

Glucose 6 Phosphate denydrogenase deficiency red-green colour blindness

haemophilia A and B

Testicular feminisation syndrome

Wiskott Aldrich syndrome