Alkaptonuria
Alkaptonuria is an inherited condition that causes urine to turn black when exposed to air. Dark pigment builds up in connective tissues such as cartilage and skin. The condition is also characterized by arthritis in adulthood.
How do people inherit alkaptonuria?
This condition is inherited in an autosomal recessive pattern, which means two copies of the gene must be altered for a person to be affected by the disorder. Most often, the parents of a child with an autosomal recessive disorder are not affected but are carriers of one copy of the altered gene.
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Content Courtesy : ghr.nlm.nih.gov