Principles of Inheritance and Variation ll PYQS NEET 12th Biology (2023)🧬

Pleiotropy is autosomal recessive trait in which single gene expresses multiple phenotypic traits
e.g. Is disease phenylketonuria which is caused in human being due to mutation in gene coding for enzyme phenylalanine hydroxylase .

* In this disease phenyl alanine is not converted into tyrosine due to non functional gene.
* Instead phenyl alanine get converted into phenyl pyruvic acid which accumulate in brain and causes mental retardation. Other symptoms include reduction in hair and skin pigmentation.

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