Class 12 · Molecular Basis of Inheritance

Regulatory Sequences and Gene Expression — NEET Biology

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Inheritance of a character is also affected by promoter and regulatory sequences of a structural gene. Hence, sometime the regulatory sequences are loosely defined as regulatory genes, even though these sequences do not code for any RNA or protein.

NCERT Biology · Class 12 · Chapter 5 · Paragraph 79
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The regulatory sequences are sometimes loosely called:

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