A dutie is something that must be done, A responsibility is something that should be done but is not required. For example, Our duties as citizens is to pay our taxes. But our responsibilities as citizens is to vote. Hope this helped.
A Duty is a responsibility that can exist because of moral or legal obligations. You're required to do those. A citizen's responsibility is something that is expected from you to do in order to help improving the society, but it is not mandatory. Voting and defending the constitution are a citizen's responsibility, but not voting and arguing against the constitution are also a citizen's rights.
