For example, removing prion genes can create sheep and cows resistant to scrapie and BSE, making the food supply safer. Pharmaceuticals could also be purer. The mouse cloning work opens a new window on early mammalian development. If Papaioannou's responses are any indication, developmental biologists will barely be able to ask questions fast enough. Other questions target the end of life.
Biological clocks run in association with chromosomes shortening over time.
She might be a pretty old sheep if her biological clock is from the sheep from which she is derived. With Dolly, the only way we can monitor her age is by looking at her teeth. The press conference speakers stuck doggedly to discussing science and technology, despite persistent pressure by the mass-media press to comment on human cloning. The repeated requests elicited only a terse opinion from Colman that cloning humans is immoral and should be banned. And perhaps because the public is sated on science news in general, and cloning talk in particular, the resulting media reports were low-key compared to the circus that greeted Dolly.