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A pleiotropic gene...

A pleiotropic gene

A

is expressed only in primitive plants

B

is a gene evolved during Pliocene

C

controls a trait only in combination with another gene

D

controls multiple traits in an individual

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The correct Answer is:
D
Pleiotropic gene is a gene that controls multiple traits is an individual. It is also called polyphenic gene, e..g. phenylketonuria causing multiple adverse effects due to the mutation in a single gene coding for enzyme phenylalanine hydroxylase.
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