I can answer this! It’s related to what are known as “molecular switches” which are a way in which cells can regulate gene expression. Certain parts of your dna can be blocked, temporarily or permanently, by cellular machinery which means that transcription machinery (the way in which mRNA molecules are made that allow peptides to be produced) can only access and process certain stretches of DNA. That’s a very simplistic way of looking at it, expression can be turned up or down too when needed. Think of it as like having a traffic controller that can block off a road and then reopen it when needed.
Latest Answers