A Pleiotropic gene

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controls a trait only in combination with another gene

controls multiple traits in an individual

is expressed only in primitive plants

is a gene evolved during Pliocene

answer is B.

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Detailed Solution

A pleiotropic gene controls multiple traits in an individual. 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 hydroxylase (single gene mutation). This manifests itself through phenotypic expression characterised by mental retardation and a reduction in hair and skin pigmentation.

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