Question

which disorder is a single - gene disease?
osteoporosis
celiac disease
type 2 diabetes
huntingtons disease

Explanation:

Single - gene diseases are caused by mutations in a single gene. Huntington's disease is caused by a mutation in the HTT gene. Osteoporosis, celiac disease, and type 2 diabetes are multifactorial (involving multiple genes and environmental factors).

Answer:

Huntington's disease