A change in a gene's DNA is called a mutation.
A mutation can result in the affected gene to no longer carry instructions to build a protein.
If sperm and eggs carry a mutation, then the offspring will inherit the mutated gene and will have the disorder, too.
Genetic disorders are the result of inheriting gene mutations.
Examples of inherited recessive genetic disorders are cystic fibrosis and sickle cell disease.
If the mutated allele is dominant, or a person inherits 2 of the mutated recessive allele, then the person will be affected by the allele's disorder.
Pedigree analysis is used to see the risk of a person inheriting the affected gene.
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