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.

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