What is the difference between chromosomes, chromatin and genes? All are the part of the nucleus of a cell and they all are present in DNA (deoxyribonucleic acid), aren't they?

What is the difference between chromosomes, chromatin and genes? - Look each one up. No need for us to rewrite an enormous amount of information that is out there, such as on wikipedia.

All are the part of the nucleus of a cell and they all are present in DNA (deoxyribonucleic acid), aren't they? - No, and no.