title: Chromosomal variants in mentally retarded and normal men.
abstract: The possible phenotypic effect of chromosomal variants is as yet an unsolved problem. QM- and C-banded chromosomes of 100 male patients with idiopathic mental retardation were compared with chromosomes of 100 Royal Military College cadets, as controls. Increased size of 9qh seems to be a factor with possible negative effects. 9qh- was found to be more common in the control sample. Another variant found more often in the retarded subjects was 16qh-. Increased frequencies of Yq+ or small inversions in chromosomes 3 and 9 were not found in the retarded.
mesh_terms: D000328:Adult; D002869:Chromosome Aberrations; D002871:Chromosome Banding; D007446:Chromosome Inversion; D002902:Chromosomes, Human, 16-18; D002906:Chromosomes, Human, 6-12 and X; D014644:Genetic Variation; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D008297:Male; D011110:Polymorphism, Genetic; D014998:Y Chromosome