Klinefelter syndrome and two fragile X chromosomes.
Two fragile X chromosomes were found in 20% of the cells in a moderately mentally retarded patient with Klinefelter syndrome.
D000328:Adult; D005600:Fragile X Syndrome / Q000235:genetics*; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics; D007713:Klinefelter Syndrome / Q000235:genetics*; D008297:Male; D012729:Sex Chromosome Aberrations / Q000235:genetics*