Hi Judy,
An interesting and "controversial" read. There are certain topics that no matter how they are approached will start by putting people on their guard. The example you give of Cuckle rejecting the use of the term "eugenics" to prenatal genetic screening shows how delicate this subject is.
And on the surface say one could offer potential parents a baby with top immune system, health, intelligent, strong, etc. won't they surely take this option. BUt as your essay points out (I think this is the point) there should be more open discussion about these issues, since they are slowly coming now, but with often less then open discussion of the issues involved. I would go further and say that with all new technologies (the steam engine, nuclear energy, computers, etc.) it would be good to have some logical discussion before they are implemented or used, but this usually is not the case. In the case of biological sciences this non-discussion / stealth discussion of the issues could have even deeper consequences as compared to similar non-discussions of nuclear energy.
I did have a coupled of questions or comments. First in regard to the Chinese policy on family size you mention "...the policy in China of strict limits the how many children couples can bring up and of what sex." (on page 4). In talking with some colleagues and some grad students from China I understood that there was a limit on the number of children in a family (generally one child per family) but I was not aware there were government restrictions on the sex i.e. you were limited to one child but it could be either male or female. However, due to cultural pressures which preferred male children many female fetuses were aborted at least in the rural areas. Anyway did the government fix both the number and sex of the child or only the number?
Second you mention that autism can be screened for similar to Down's syndrome. Is this true? My (poor) understanding of autism is that is has a very broad range, it is not clear if it is one condition or a host of related conditions. However I do recall a colleague of mine had mentioned that when his second child was on the way some prenatal testing showed signs for concern. But the doctors were not able to quantify the extent of autism his child would have or even if the child would definitely have autism. So maybe there is some screening for this?
Last, my impression was that our ability to predict biological outcomes is a lot more fuzzy/imprecise compared to predicting physics outcomes. For example if you feed and electron through a magnetic field and you know the field strength and speed of the electron you can describe a lot of things very accurately about how this or any other electron will move through this magnetic field. If you look at the genetic make up of an individual and asked "Will this person be intelligent enough to formulate a Unified Field Theory?" or "Will this person be fast enough to run a 3:30 mile when they grow up?" I think it would be almost impossible to say. And I think you mention this in your essay (in terms of intelligence anyway since I think "intelligence" is such a broad based phenomenon it is hard to predict with our present understanding of genetics.
Anyway an enjoyable read. Best of luck.
Doug