Increase in the incidence of the fragile site Xq27 in prometaphases.
D000705:Anaphase; D002478:Cells, Cultured; D043283:Chromosome Fragile Sites; D002873:Chromosome Fragility; D005260:Female; D005600:Fragile X Syndrome / Q000235:genetics*; D005787:Gene Frequency; D005819:Genetic Markers; D006801:Humans; D008214:Lymphocytes / Q000648:ultrastructure; D008297:Male; D010641:Phenotype; D012729:Sex Chromosome Aberrations / Q000235:genetics*; D012730:Sex Chromosomes / Q000648:ultrastructure*; D014960:X Chromosome / Q000648:ultrastructure*
D005819:Genetic Markers