Which genetic condition is considered a single-gene disorder?

A genetic condition that is considered to be single gene disorder are the following;

·         Familial hypercholesterolemia

·         Polycystic kidney disease

·         Neurofibromatosis type 1

·         Hereditary spherocytosis

·         Marfan syndrome

·         Huntington’s disease

·         Sickle cell anemia

·         Cystic fibrosis

·         Tay-Sachs disease

·         Phenylketonuria

·         Mucopolysaccharidoses

·         Lysosomal acid lipase deficiency

·         Glycogen storage disease

·         Galactosemia

·         Duchenne muscular dystrophy

·         Hemophilia

one day because their over eating or whenever it kicks in their body

i have no clue xdxdxdxdxdxd