Dr. John Waterstone:

-----I have some slight issues. The planet is becoming overpopulated by human beings and the natural habitat is being destroyed. Fast forward 50 or 100 years and it will become unethical for human beings to have more than two children. Do we want to consider diversity if we have the means to ensure that? Supposing it is possible in the future to look at an embryo through a microscope and say whether it is a boy or girl embryo, would it be reasonable to restrict couples' choice to gender balance? I have slight reservations, although they are not shared by my colleague, Dr. Wingfield, at all. I am not sure whether-----