What do you think of sex selection and other types of genetic alteration?

CNN: The big debate: Should we alter human genes?

One of the organizations researching genetic alteration is the University of California Irvine's Sue and Bill Gross Stem Cell Research Center.

CNN: Designer babies: Creating the perfect child

The center's executive director, Richard Hayes, fears genetic alteration could lead to a race of genetic elites -- or cause irreversible damage to the human race.

CNN: The big debate: Should we alter human genes?

While many scientists talk of the benefits of genetic screening and genetic alteration, including most notably the potential for eliminating hereditary diseases and disorders, others are more skeptical and have great concerns about the technology.

CNN: The big debate: Should we alter human genes?

Hayes said his organization supported the use of embryo screening to help prevent the passing on of serious diseases and disorders like Cystic Fibrosis, but is wary of other technologies and how genetic screening and alteration can be misused.

CNN: Designer babies: Creating the perfect child