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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.
But the genes in your DNA don't make protein directly. Instead, special proteins called enzymes read and copy (or transcribe) the DNA code. The segment of DNA to be transcribed gets unzipped by an enzyme, which uses the DNA as a template to build a single-stranded molecule of RNA.