As noted in previous responses to this question, ethics will always play a role in regulating scientific activities. Although it may be helpful to learn new things by unethical methods, the result of this experimentation and discovery could be devastating to our culture. Because of these risks, ethics will always be a part of science. Ethics also act as insurance to scientists since their every idea is heavily scrutinized before it is carried out. This gives scientists a method of defense if anything should go wrong because their experiments must be approved, and the blame for any negative results is shared with the moral regulators of science.
Ethics is concerned with human character and conduct.
With this basic definition in mind, there is no finite interaction between these two disciplines. L. Wingblade's response presents some ideal points. The methodical approach of science and ethics are very different. Science uses empirical methods and interprets data, while ethics focuses on the moral grounds as to why we should or should not do things. In that aspect, the two disciplines do differ.