sentence2_structure: A person<>affected<>by an autosomal dominant disorder$$$A person affected by an autosomal dominant disorder<>has<>one mutated allele
sentence1: Frasier syndrome is inherited in an autosomal dominant fashion, indicating the need for only one mutated allele in a cell to lead to expression of the disease.
sentence2: A person affected by an autosomal dominant disorder has one mutated allele.
question: What is needed for a person to be affected by an autosomal dominant disorder?