The following are single gene disorders except

Single-Gene Disorders with Nonclassic Inheritance It has become increasingly evident that transmission of ceain single-gene disorders does not follow classic Mendelian principles. This group of disorders can be clas- sified into four categories: * Diseases caused by trinucleotide-repeat mutations * Disorders caused by mutations in mitochondrial genes * Disorders associated with genomic imprinting * Disorders associated with gonadal mosaicism Disorders include : hemochromatosis,cystic fibrosis, Huntington disease Ref Robbins 9/e pg 168