Fragile chromosomes in a family.
D000328:Adult; D002648:Child; D002873:Chromosome Fragility; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D006801:Humans; D007951:Leukemia, Myeloid / Q000235:genetics*; D007962:Leukocytes / Q000648:ultrastructure