Alkaptonuria

Alkaptonuria is an autosomal recessive trait that affects many parts of a victim's body. The genetic disorder has been mapped to chromosome 3, which is where the abnormality occurs. As an autosomal recessive trait, the parents of someone with alkaptonuria show no signs of the disease, but rather carry the gene and have a chance of passing it on the offspring. Two carrier parents have a 25% chance that the child will inherit two normal genes and, for a child with alkaptonuria, a 50% chance of the child being a carrier, and a 25% chance show no signs of the disease.
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