title: X-linked mental retardation with macro-orchidism and marker X chromosomes.
abstract: A family with X-linked mental retardation and a marker X chromosome was ascertained by the presence of macro-orchidism in the three institutionalized probands. Verbal evaluation revealed a generalized language disability with commonly occurring articulation errors. The heterozygous females in this family exhibited some reduction in mental ability; the marker X chromosome was demonstrated in both sexes.
mesh_terms: D005260:Female; D006580:Genetic Carrier Screening; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D007621:Karyotyping; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D012729:Sex Chromosome Aberrations / Q000235:genetics*; D012730:Sex Chromosomes; D013733:Testicular Diseases / Q000235:genetics*; D014960:X Chromosome