What is the process by which the DNA sequence in a gene is copied into mRNA?

The process by which the DNA sequence in a gene is copied into mRNA is known as transcription. During transcription, an enzyme called RNA polymerase binds to the DNA at the gene's promoter region and unwinds the DNA strands. This allows the RNA polymerase to read the template strand of the DNA and synthesize a complementary strand of messenger RNA (mRNA) by matching RNA nucleotides to the DNA template. The result is an mRNA molecule that carries the genetic information required for protein synthesis from the nucleus to the cytoplasm, where the process of translation occurs. This step is crucial for gene expression, as it creates a copy of the genetic code in a format that can be utilized by ribosomes to produce proteins.