18 Science and technology 91 Genetic engineering a) Choose the correct word in each pair and write down the sentence. British scientists at the University of Sheffield Centre for Stem Cell Biology have (announced • denounced) 1 that it may one day be possible to clone human eggs and (spam • sperm) 2 from stem cells. This means the entire process of human (conception • perception) 3 could take place in a science laboratory. It would revolutionise fertility treatments for (couples • couplets) 4 unable to have children of their own as well as enable same-sex couples to have children that (shape • share) 5 the genetic code of both partners. Fertility scientists (described • inscribed) 6 the research as an exciting step forward. The (earliest • latest) 7 findings are believed to have huge implications for the way studies that investigate the (processes • production) 8 of egg and sperm development can be (overtaken • undertaken) 9 . Nevertheless, we are still in the early stages of fully understanding the biology of conception. Up to now, scientists cannot entirely explain why some men and women are (impotent • infertile) 10 , which means that they cannot produce sperm and eggs of their own. b) Read the text about human cloning. Some words are missing. Complete the text by writing one word for each gap (1–10) in the spaces provided. The first one (0) has been done for you. On 5 July 1996, the most famous sheep in modern history was … 0 . Ian Wilmut and a group of Scottish scientists announced that they had successfully cloned a sheep named Dolly. If you … 1 Dolly beside a “naturally” conceived sheep, you wouldn’t notice any … 2 between the two. While Dolly’s birth marked an incredible scientific breakthrough, it also set off … 3 in the scientific and global community about what – or who – might be next to be “duplicated”. Cloning sheep and other nonhuman beings seemed more ethically benign than potentially cloning … 4 . Re-engineering the human reproductive process has made many nervous that cloning crosses the ethical boundaries of science. But we can’t fully evaluate the moral … 5 without first addressing the potential benefits of human cloning. Therapeutic cloning holds the most promise for medical advancement. Therapeutic cloning is the process by which a person’s DNA is used to … 6 an embryonic clone. However, instead of inserting this embryo into a surrogate mother, its cells are used to grow stem cells. These stem cells could become the basis for customised human … 7 kits. They can grow replacement … 8 , such as hearts, livers and skin. And since the stem cells would come from embryo clones using your own DNA, your body would more readily … 9 them. Yet, some scientists believe today’s technology isn’t ready to be tested on humans. Cloning technology is still in its early stages, and nearly 98 per cent of cloning efforts end in … 10 . Opponents of cloning point out that while we can euthanise defective clones of other animals, it’s morally problematic if this happens during the human cloning process. 0 born 1 6 2 7 3 8 4 9 5 10 3 ✔ Nur zu Prüfzwecken – Eigentum des Verlags öbv
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