<unk>  (previously known as X-linked mental retardation) refers to forms of<unk><unk>  which are specifically associated with X-linked recessive inheritance.
As with most X-linked disorders, males are more heavily affected than females. Females with one affected X chromosome and one normal X chromosome tend to have milder symptoms.
Unlike many other types of<unk><unk> , the genetics of these conditions are relatively well understood. It has been estimated there are ~200 genes involved in this syndrome; of these ~100 have been identified.<unk>  accounts for ~16% of all cases of<unk><unk>  in males.
X-linked intellectual disability
Pelger-Huet abnormality
Fragile X syndrome
Foster Kennedy syndrome
Zellweger syndrome
Axenfeld syndrome
Hypohidrotic ectodermal dysplasia
Syndrome X