If all human cells contain the same DNA, then how come your eye cells and your bone cells are different?

Question

Is it something encoded in the DNA itself, or something on the side that makes cells different?

In: Biology

Answer 1

The DNA is like a complete list of instructions for the entire body. Each cell doesn’t use all of those instructions though, they just focus on the instructions for the particular part they are meant to be. So while your eyes have a copy of the code to make every cell in your body in them, they are only using the part that makes eyes.