title: The expression of fragile X chromosomes in members of the same family at different times of examination.
abstract: Three brothers with fragile X chromosomes were repeatedly examined using the same culture and preparation techniques. It was observed that a given individual showed a very constant frequency of fragile sites at his X chromosomes, whereas large differences in the fragile X counts occurred between the three brothers.
mesh_terms: D005600:Fragile X Syndrome / Q000235:genetics* / Q000473:pathology; D006801:Humans; D007621:Karyotyping; D008297:Male; D012729:Sex Chromosome Aberrations / Q000235:genetics*; D013223:Statistics as Topic; D013997:Time Factors