正在加载图片...
that better resist cold and pests The researchers also say rice is an excellent choice for genetic mapping and engineering. Rice genes have only about 390 million chemical bases. That maight sound like a lot. But other major food grains have thousands of millions(S9)The new map could better explain more than iust rice. Rice shares a common ancestor with other cereal crops. Because rice is the first cereal crop to be fully analyzed researchers expect that sufficient knowledge of its genetic information will reveal the heredity of more complex grains, includ ing corn, wheat and barley (S10)While significant progress has been made in the analysis of the rice genome. the mapping of human genes is also making headway, When scientists can identify and manipulate genes that cause certain diseases, mankind will cure them easily. The human genetic map may help us control a persons height, weight, appearance and even length of life Task3: The first Cloned cat Scrip In the age-old battle of cats and dogs, score one for the cats. Researchers at Texas A&M University recently announced that they have successfully cloned a cat name Rainbow- the first pet ever cloned-after several years of unsuccessful efforts to clone a dog name missy The ork, financed by a company hoping to prov ide pet-cloning services to wealthy owners, adds cats to a growing list of successfully cloned animals that includes pigs sheep, cattle and I The success demonstrates cloning is a technology that could be transferred to other animal families as well. The accomplishment may prov ide new tools for studying d iseases such as cats'AIDS a valuable research model for aids in humans Research into animal cloning remains an important scientific alternative until the issue of human cloning is settled. And that seems unlikly in the immed iate future, for it involves religious and moral principles. There are, for example, groups that insist no one should be allowed to take on the role of god the creator To create cloned cat embryos for the experiment, researchers transferred DNA from adult cat cells into egg cells stripped of their own genetic information. Out of 82 attempts with cloned embryos, one attempt resulted in a failed pregnancy, and another yielded a kitten named CC, delivered from a surrogate mother on December 22. The kittens name refers to"Carbon Copy"and "Copycat", the name of the cloning Cloning attempts with dogs have proven unsuccessful in part because dogs reproductive cycles are more complicated The technique may also work with endangered cats such as the African wild cat fishing cat and blackfooted ca Ironically, the increased knowledge of cat reproduction may best be suited forthat better resist cold and pests. The researchers also say rice is an excellent choice for genetic mapping and engineering. Rice genes have only about 390 million chemical bases. That maight sound like a lot. But other major food grains have thousands of millions. (S9) The new map could better explain more than just rice. Rice shares a common ancestor with other cereal crops. Because rice is the first cereal crop to be fully analyzed, researchers expect that sufficient knowledge of its genetic information will reveal the heredity of more complex grains, including corn, wheat and barley. (S10) While significant progress has been made in the analysis of the rice genome, the mapping of human genes is also making headway. When scientists can identify and manipulate genes that cause certain diseases, mankind will cure them easily. The human genetic map may help us control a person’s height, weight, appearance and even length of life. Task3: The First Cloned Cat Script In the age-old battle of cats and dogs, score one for the cats. Researchers at Texas A&M University recently announced that they have successfully cloned a cat name Rainbow—the first pet ever cloned—after several years of unsuccessful efforts to clone a dog name Missy. The ork, financed by a company hoping to provide pet-cloning services to wealthy owners, adds cats to a growing list of successfully cloned animals that includes pigs, sheep, cattle and mice. The success demonstrates cloning is a technology that could be transferred to other animal families as well. The accomplishment may provide new tools for studying diseases such as cats’ AIDS, a valuable research model for AIDS in humans. Research into animal cloning remains an important scientific alternative until the issue of human cloning is settled. And that seems unlikly in the immediate future, for it involves religious and moral principles. There are, for example, groups that insist no one should be allowed to take on the role of God the Creator. To create cloned cat embryos for the experiment, researchers transferred DNA from adult cat cells into egg cells stripped of their own genetic information. Out of 82 attempts with cloned embryos, one attempt resulted in a failed pregnancy, and another yielded a kitten named CC, delivered from a surrogate mother on December 22. The kitten’s name refers to “Carbon Copy” and “Copycat”, the name of the cloning project. Cloning attempts with dogs have proven unsuccessful in part because dogs’reproductive cycles are more complicated. The technique may also work with endangered cats such as the African wildcat, fishing cat and blackfooted cat. Ironically, the increased knowledge of cat reproduction may best be suited for
<<向上翻页向下翻页>>
©2008-现在 cucdc.com 高等教育资讯网 版权所有