69热视频

In-vitro fertilization and genetic testing are increasingly used, including in Canada, by couples capable of conceiving naturally, to screen out not just catastrophic diseases but other 鈥榰ndesirable' conditions. Will the future see a genetic elite rise above the messy, natural masses, and is that so bad?

One expert says, 鈥極ur next major leap of evolution 鈥� will be one that we control.' Seang Lin Tan, a renowned fertility specialist at 69热视频 who worked with Britain's IVF pioneers, agrees that the technology comes with tricky ethical issues. To him, the most vexing is whether embryos should be discarded for carrying disease genes that may not have an effect until well into adulthood.

Dr. Tan, also medical director of the Montreal Reproductive Centre, dismisses as 鈥渁 lot of hype鈥� the fear that couples will use PGD to make blond, blue-eyed babies. But he sympathizes with those who fear that the future may bring, say, breast cancer: 鈥淚f you have this disease in your family 鈥� and you're doing PGD anyway, I think it's reasonable.鈥�