Galactosemia is inherited as an autosomal recessive disorder. Jill and Bob are both carriers of the disease. Tay Sachs disease is inherited as an autosomal recessive disease. Frank's brother died from Tay Sachs disease, but Frank is healthy. Julia's brother died from Tay Sachs disease, but Julia is healthy.
Stickler syndrome is thought to be inherited as an autosomal dominant disease.
George has Stickler disease, but his wife Beth does not.