How do nucleic acids help determine if you have brown eyes or blues eyes?

I will try to answer this as best as I can- though I'm not entirely sure what it is you're asking.Nucleic acids are what make up DNA and RNA. DNA and RNA is found on chromosomes from your parents. The DNA is made up of understood letters- A,T,C and G. The Biology community uses these letters to help represent parts of the coding. RNA reads the DNA that codes for eye color and sends a message for the cell to start making protein accordingly. So, if the nucleic acid in which your DNA is made up of codes for blue eyes, you will get blue eyes, same thing for brown.