Biochemistry General bf8b1321 DNA repair defect is seen in A Xeroderma pigmentosa B Bloom's syndrome C Ataxia telangiectasia D All of these High-Yield Explanation Examples of DNA repair defects : (1) Xeroderma pigmentosa, (2) Ataxia telangiectasia, (3) Fanconi's anaemia, (4) Bloom's syndrome, (5) HNPCC.