If an individual changes his diet because it is discovered he has phenylketonuria (PKU) , then one can conclude that although he had the for PKU, it did not lead to the of retardation.

A) genotype; phenotype
B) phenotype; genotype
C) dominant gene; recessive trait
D) recessive gene; dominant trait

Question

If an individual changes his diet because it is discovered he has phenylketonuria (PKU) , then one can conclude that although he had the __________ for PKU, it did not lead to the __________ of retardation.

A) genotype; phenotype
B) phenotype; genotype
C) dominant gene; recessive trait
D) recessive gene; dominant trait

Engr. Abdullah Alamri · Accepted Answer

Final Answer : A, Explanation :  PKU is caused by a recessive gene, meaning an individual must inherit two copies of the gene (one from each parent) in order to develop the condition. This would result in a specific genotype. However, it is only when the condition leads to the phenotypic expression of retardation (via an inability to metabolize phenylalanine) that it becomes clinically relevant. Thus, changing the diet to prevent the phenotypic expression of PKU indicates that the individual had the genotype for PKU but not the phenotype of retardation.

If an individual changes his diet because it is discovered he has phenylketonuria (PKU) , then one can conclude that although he had the for PKU, it did not lead to the of retardation.

A) genotype; phenotype
B) phenotype; genotype
C) dominant gene; recessive trait
D) recessive gene; dominant trait

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Learning Objectives

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