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A pleiotropic gene :

Option: 1

is a gene evolved during Pliocene.


Option: 2

controls a trait only in combination with another gene


Option: 3

controls multiple traits in an individual.


Option: 4

is expressed only in primitive plants.


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A pleiotropic gene is one that regulates several phenotypic features in a person. A pleiotropic gene influences metabolic pathways, which result in a variety of phenotypes. Pleiotropism is demonstrated by phenylketonuria. A mutation in the gene that encodes for phenylalanine hydroxylase causes this condition. Phenylketonuria is distinguished by phenotypic characteristics such as skin coloring, hair loss, and mental impairment.

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