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NEET2023ZoologyPrinciples of Inheritance and VariationActual

The phenomenon of pleiotropism refers to:

Options

  1. AMore than two genes affecting a single character.
  2. BPresence of several alleles of a single gene controlling a single crossover.
  3. CPresence of two alleles, each of the two genes controlling a single trait.
  4. DA single gene affecting multiple phenotypic expressions.

Correct answer

D. A single gene affecting multiple phenotypic expressions.

Step-by-step solution

A single gene can exhibit multiple phenotypic expression in an organism. Such a gene is called a pleiotropic gene. The underlying mechanism of the pleiotropy is the effect of a gene (and its alleles) on the metabolic pathways which contribute towards different phenotypes. Some common example of pleiotropy is phenylketonuria, a disease is caused by mutation in the gene that codes for the enzyme phenyl alanine hydroxylase (single gene mutation). This results into the phenotypic expression characterised by mental reta

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