Each cell has the same DNA, so DNA does not play a role in differentiation.
Explanation:
All the parts of a person's body has same DNA and same genes.
It is the function of RNA to carry genetic code from DNA and function protein synthesis.
Although the different cells and tissue have different proteins their DNA is same.
The genetic instructions carried by the DNA is RNA and RNA allows cell to create amino acid which is used in gene synthesis, expression and regulation.
