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NEETZoologyPrinciples of Inheritance and Variation

What enzyme is deficient in the described inborn error of metabolism?

Options

  1. APhenylalanine hydroxylase
  2. BTyrosine kinase
  3. CGlutamate decarboxylase
  4. DAspartate transaminase

Correct answer

A. Phenylalanine hydroxylase

Step-by-step solution

We have so far seen the effect of a gene on a single phenotype or trait. There are however instances where a single gene can exhibit multiple phenotypic expression. Such a gene is called a pleiotropic gene. The underlying mechanism of pleiotropy in most cases is the effect of a gene on metabolic pathways which contribute towards different phenotypes. An example of this is the disease phenylketonuria, which occurs in humans. The disease is caused by mutation in the gene that codes for the enzyme phenyl alanine hydro

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