Autosomal recessive inheritance pattern

To have an autosomal recessive disorder, you inherit two abnormal genes, one from each parent. A carrier has one abnormal gene (recessive gene) and one normal gene (dominant gene). Carrier health is not affected. Two carriers have a 25% chance of having an unaffected child with two normal genes (left), a 50% chance of having an unaffected child who also is a carrier (middle), and a 25% chance of having an affected child with two recessive genes (right).