Obviously some things will pop to mind TODAY.... There are many birth defects out there that are genetic... And IMO it is hard to say that we should NOT repair those defects if we hvae the capabilities.... IMO it is difficult to say we should to RESEARCH how ot alter an indivdiuals DNA in the interest of correcting those defects....

But once we figure out HOW to fix DNA, and we fix the OBVIOUS ones... what next... IMO it is a very interesting challenge...

The terms, 'idiot', 'imbecile' and 'moron' used to be used in the medical/psychiatric world to describe specific IQ levels.... someone with an IQ of 55 was considered to have a genetic defect (as I recall it fit in the category of 'imbecile') and probably not unreasonably so... So, let's say we can "correct" that... What is the "normal" that the indivdiual can ethically be adjusted to? Is everyone less than a "genuis" defective? Or should doctors only be allowed to correct to an IQ of 140?

An IQ test was part of an entrance exam I took many years go... I was tested to an IQ if 168. Not a genuis, but pretty good... Should it be acceptable for a doctor to "correct" me to a genuis level as while I am not seriously retarded in my mental capacity, I am SLIGHTLY behind where I COULD be?

And then we get into all of they raw physical issues...

What is a "normal" height? I am a BIT short statistically speaking 5'7" in an adult male. One of my friends is 5'2". Is it ethical for him to be 'fixed' and not me? Or both of us?

An unusually light skin tone (redheads) often results in dermatological issues. Skin cancers, etc... Would it be OK to gentically make someone a bit darker? Now how about a bit lighter? Is there a DEGREE of melanin content that can ethically be adjusted, or can it only be done for MEDICAL necessity?

Ugly people have a harder time reproducing... Is that a defect?

While morbid obesity often has genetic causes, and is CERTAINLY a medical problem, how about carrying just a bit of a beer gut like me? IMO carrying just a bit of extra weight does increase certain health risks, but how much extra justifies genetic alteration?

I think that before this type of research can ETHICALLY grow into full scale human testing and application, we really need to develop a whole lot better computer modeling of the human genome... IMO we need to know ALL of the impacts of replacing a given set of genes with another set BEFORE we try it on a living human being.