from my observations to many nursinlg curriculums, I did not see pure genetic course for nurses! usually this part is covered by medical school for nursing students. Also, the total credit hours/years to study nursing is filled with topics that are core to nursing.
Integrate genetics in nursing depends on the number of nurses involved in the genetic work such as genetic counseling or genetic research. Also, it depends on the community need for such services. I think integrate genetics as advance course in nursing is better to be in postgraduate curriculum.