Inheritable myopathies can run in a family, even if only one person in the biological family has it.
Inheritable myopathies are inherited in all three ways. For many X-linked diseases, a normal copy of the gene can compensate for the defective copy. Because males have only one X chromosome while females have two, X-linked diseases almost always affect males. Therefore, autosomal diseases affect males and females equally. Autosomal recessive means that two copies of a defective gene are required for the full-blown disease.