how is phenylketonuria an example of pleiotropy? please explain in simple words

dear Arun sir I know what is phenylketonuria

I just wanted to know how phenylketonuria is related to pleiotrophy

Dear student 

In pleiotropy a single gene affects many phenotypic characters. Mutation in this gene will have affect on many phenotypic traits simultaneously. 

Here, In phenylketonuria, there is tyrosine deficiency, mental retardation,, light hair and skin color. So the mutant gene affects many phenotypic characters therefore it is an example of pleiotropy.

WITH REGARDS

MAHIMA 

ASKIITIANS FORUM EXPERT