HENRY T. GREELY

If we we were to intentionally set out to cause the extinction of a species, we should think about that. I would want there to be some consideration and reflection of a social consensus before we take that step.

Fairness is a central issue, Greely said. What if some people have access to the technology and others don't? There will certainly be international disparities, and possibly national ones as well.

What happens if parents pick an embryo thinking they're getting a boy who will grow up to be like former Stanford quarterback Andrew Luck, but instead when the child grows up, he wants to be poet?

People who are infertile will be able to have their own genetic children. So may same sex couples, since it may well be possible to make eggs from a man's skin cells or sperm from a woman's.

It will save the health care system a lot of money. You don't need to prevent the births of very many really sick babies to pay for hundreds or thousands of attempts at making babies through easy PGD.

The ability to make gametes from skin cells might have some undesirable consequences. For example, someone could take a paper coffee cup that you casually tossed in the trash and turn you into a parent without your knowledge or consent. We probably need some laws to deal with that; unconsenting parenthood seems like a bad idea.

We can remake the biosphere to be what we want, from woolly mammoths to nonbiting mosquitos. Do we want to live in nature or in Disneyland?

If we we were to intentionally set out to cause the extinction of a species, we should think about that. I would want there to be some consideration and reflection of a social consensus before we take that step.

The ability to make gametes from skin cells might have some undesirable consequences. For example, someone could take a paper coffee cup that you casually tossed in the trash and turn you into a parent without your knowledge or consent. We probably need some laws to deal with that; unconsenting parenthood seems like a bad idea.

People who are infertile will be able to have their own genetic children. So may same sex couples, since it may well be possible to make eggs from a man's skin cells or sperm from a woman's.

Fairness is a central issue, Greely said. What if some people have access to the technology and others don't? There will certainly be international disparities, and possibly national ones as well.

It will save the health care system a lot of money. You don't need to prevent the births of very many really sick babies to pay for hundreds or thousands of attempts at making babies through easy PGD.

What happens if parents pick an embryo thinking they're getting a boy who will grow up to be like former Stanford quarterback Andrew Luck, but instead when the child grows up, he wants to be poet?

We can remake the biosphere to be what we want, from woolly mammoths to nonbiting mosquitos. Do we want to live in nature or in Disneyland?