Is this true or false cystic fibrosis is caused by a mutation that is the dominant allele of a gene?

False. Cystic fibrosis is caused by a mutation in the CFTR gene, which is inherited in an autosomal recessive manner. This means that an individual must inherit two copies of the mutated gene (one from each parent) to develop the disease. If a person carries only one copy of the mutated gene, they are a carrier but do not exhibit symptoms of cystic fibrosis.