A) the urine turns black
B) the pathway of phenylalanine metaboIism is blocked
C) two genes for the trait are inherited
D) all of the above
Correct Answer: D
Solution :
Alkaptonuria is a metabolic disorder, controlled by autosomal-recessive gene. There is absence of homogentisic acid oxidase enzyme which oxidises homogentisic acid, a product of tyrosine catabolism, urine of such patients darkens on exposure to air.
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