Final answer:
Alkaptonuria is a pleiotropic disorder, which means a single gene mutation leads to multiple physical effects.
Step-by-step explanation:
Clara has alkaptonuria, a condition characterized by a variety of symptoms including back spasms, dark urine, arthritis, hearing loss, and other complications related to the inability to properly metabolize phenylalanine and tyrosine.
These diverse symptoms illustrate that alkaptonuria is a pleiotropic disorder, meaning one single gene mutation causes multiple effects throughout different systems of the body.