Ethics and biotech

Should drugs and other treatments used for curing disease also be used to extend our physical capabilities, to, say, enhance athletic performance?

If it becomes possible to select the sex and other characteristics of children, would it be morally objectionable to do so? What, if anything, is wrong with the creation of human-animal hybrids?

These are some of the questions explored in a Harvard course (a short report is here) on "Ethics, Biotechnology and the Future of Human Nature", taught by Douglas Melton, a professor of molecular and cellular biology.