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A gene (def) is a segment of DNA that codes for a functional product (mRNA, tRNA, or rRNA). Since the vast majority of genes are transcribed into mRNA and mRNA is subsequently translated into polypeptides or proteins, most genes code for protein synthesis. gene (def) is a segment of DNA that codes for a functional product (mRNA, tRNA, or rRNA). Since the vast majority of genes are transcribed into mRNA and mRNA is subsequently translated into polypeptides or proteins, most genes code for protein synthesis.
Transcription is the synthesis of RNA which carries the genetic information present in DNA (Fig. 1). The DNA is double stranded and can theoretically code for two separate RNA molecules (Jain, 2000). However, it has been found that only one of the two strands of the gene is transcribed (Jain, 2000).