The lab analyst performs a chromosome analysis for a breakage syndrome and scores 50 to 100 cells, counts 20 cells, and prepares two karyotypes. Chromosomes are DNA containing structures in cells. Breakage syndromes cause instability of DNA in disorders such as ataxia telangiectasia, a multisystem condition affecting walking and the immune system; Fanconi anemia, a condition with decreased amounts of all blood cells and growth impairment; and fragile X, a genetic defect causing mental retardation.
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