Answer:
Regulatory elements produced by many Hox genes is d) transcriptional factors.
Explanation:
Gene expression is known as the process by which information from a gene is used to synthesis a functional gene product i.e proteins , but in non-protein-coding genes such as transfer RNA (tRNA) or small nuclear RNA (snRNA) genes, the functional product is a functional RNA. It is the process by which the heritable information in a gene, the sequence of DNA base pairs, is translated into a functional gene product, such as protein or RNA.
Gene expression involves two stages
1.Transcription
2.Translation
Gene regulation most commonly can occur at the level of transcription, controlled by active proteins called transcription factors.Following are the active transcription factors controlling gene expression
The structural genes contain the code for the proteins products that are to be produced. Regulation of protein production is largely achieved by modulating access of RNA polymerase to the structural gene being transcribed.
The promoter gene doesn't encode anything; it is simply a DNA sequence that is initial binding site for RNA polymerase.
The operator gene is also non-coding; it is just a DNA sequence that is the binding site for the repressor.
The regulator gene codes for synthesis of a repressor molecule that binds to the operator and blocks RNA polymerase from transcribing the structural genes.
