Below is an instruction from Human. Write a response.
    ### Instruction:
    Is spinal muscular atrophy inherited ?
    ### Response:
    Types I, II, III, and IV spinal muscular atrophy are inherited in an autosomal recessive pattern, which means both copies of the SMN1 gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
    