Answer :

a real life example of the nucleus is like a boss of a company.
a real life example of the dna is like the instructions on how to cook cookies.
AL2006

Every cell in your body has a nucleus, and a full set of your DNA in it.

A hen's egg is a single cell.  The small, spongy gray thing in the middle of the yolk is the cell's nucleus.  The nucleus holds a complete set of the chicken's chromosomes, the chromosomes are composed of the chicken's genes, and the genes are made of DNA.