Pathology All of the following immunodeficiency diseases are due to Chromosomal instability or defective repair of genes except A Ataxia telangiectasia B Bloom syndrome C Seckel syndrome D Chediak - Hegashi syndrome 💡 Explanation All of the following immunodeficiency diseases are due to Chromosomal instability or defective repair of genes except ✓ Correct Answer: D. Chediak - Hegashi syndrome