Here's a breakdown:

* Transcription: This is the process where a section of DNA (a gene) is used as a template to create a complementary RNA molecule. This occurs in the nucleus of a cell.

* The DNA double helix unwinds and separates, exposing the gene to be copied.

* An enzyme called RNA polymerase moves along the DNA strand, reading the sequence of bases.

* RNA polymerase uses the DNA sequence as a template to build a new RNA molecule, following the base pairing rules (adenine pairs with uracil, guanine pairs with cytosine).

* The resulting RNA molecule is a single-stranded copy of the DNA gene.

After transcription, the newly formed mRNA molecule is processed and transported out of the nucleus into the cytoplasm, where it is used to direct the synthesis of proteins in a process called translation.