(a) polymorphic genes
(b) operator genes
(c) reductant genes
(d) regulatory genes
[CBSE AIPMT 1998]
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Genes that are involved in turning on or off the transcription of a set of structural genes are called
Genes that are involved in turning on or off the transcription of a set of structural genes are called
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Correct Option (d) Reason : The switching on and off of an operator is controlled by respressor protein which is coded by the regulator gene R.