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NEETZoologyPrinciples of Inheritance and Variation

What is the underlying mechanism of pleiotropy in most cases?

Options

  1. AGenetic mutation
  2. BEnvironmental influence
  3. CThe effect of a gene on metabolic pathways
  4. DNutritional deficiency

Correct answer

C. The effect of a gene on metabolic pathways

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 expressions. 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 phenylalanine hydr

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