<prompt> All of the following conditions have autosomal dominant inheritance except -Fabry diseaseMarfans syndromeOsteogenesis imperfectaEhlers Danlos syndrome  <response>: Ans. is a i.e., Fabrys disease Autosomal dominant disorders o Normally a gene pair has two alleles. o When one allele becomes abnormal due to mutation it is called heterozygous state. o When both the alleles become abnormal due to mutation it is called homozygous state. o Autosomal dominant disorders are manifested in heterozygous state, i.e. only if one allel is abnormal the disease will be manifested. 