If every cell in the body contains a complete copy of the bodies DNA, how does the cell know which parts of the DNA to read, and which parts not to read, relevant to where it is in the body? This seems mind-boggling that the cell can do this.

 

Thanks for your thoughts,

 

Dylan

Key elements are regulation and signal cascades. The various cell types have huge amount of proteins that sense and produce signals of various sort, integrate that information and regulate gene expression to ensure function.