Here's how it works:

* DNA contains the instructions: DNA acts like a blueprint, containing the instructions for building and maintaining an organism. These instructions are encoded in the sequence of its four nucleotide bases (adenine, guanine, cytosine, and thymine).

* Transcription: The DNA code is first transcribed into a messenger RNA (mRNA) molecule. This mRNA molecule carries the genetic instructions from the DNA in the nucleus to the ribosomes in the cytoplasm.

* Translation: At the ribosomes, the mRNA code is translated into a chain of amino acids. Each group of three nucleotides (codon) in the mRNA specifies a particular amino acid.

* Protein assembly: These amino acids are linked together in a specific order, forming a protein. The sequence of amino acids determines the protein's unique shape and function.

So, the genetic code in DNA ultimately dictates the production of proteins, which perform a wide range of functions in the body, from building tissues to regulating chemical reactions.