首页
登录
职称英语
If you go down to the woods today, you may meet high-tech trees—genetically
If you go down to the woods today, you may meet high-tech trees—genetically
游客
2023-08-11
36
管理
问题
If you go down to the woods today, you may meet high-tech trees—genetically modified to speed their growth or improve the quality of their wood. Genetically-engineered food crops have become increasingly common, albeit controversial, over the past ten years. But genetic engineering of trees has lagged behind.
Part of the reason is technical. Understanding, and then altering, the genes of a big pine tree are more complex than creating a better tomato. While tomatoes sprout happily, and rapidly, in the laboratory, growing a whole tree from a single, genetically altered cell in a test tube is a tricky process that takes years, not months. Moreover, little is known about tree genes. Some trees, such as pine trees, have a lot of DNA—roughly ten times as much as human. And, whereas the Human Genome Project is more than half-way through its task of isolating and sequencing the estimated 100, 000 genes in human cells, similar efforts to analyze tree genes are still just saplings(幼苗).
Given the large number of tree genes and the little that is known about them, tree engineers are starting with a search for genetic "markers". The first step is to isolate DNA from trees with desirable properties such as insect resistance. The next step is to find stretches of DNA that show the presence of a particular gene. Then, when you mate two trees with different desirable properties, it is simple to check which offspring contain them all by looking for the genetic markers. Henry Amerson, at North Carolina State University, is using genetic markers to breed fungal resistance into southern pines. Billions of these are grown across America for pulp and paper, and outbreaks of disease are expensive. But not all individual trees are susceptible. Dr. Amerson’s group has found markers that distinguish fungus-resistant stock from disease-prone trees. Using traditional breeding techniques, they are introducing the resistance genes into pines on test sites in America.
Using genetic markers speeds up old-fashioned breeding methods because you no longer have to wait for the tree to grow up to see if it has the desired traits. But it is more a sophisticated form of selective breeding. Now, however, interest in genetic tinkering(基因修补)is also gaining ground. To this end, Dr. Amerson and his colleagues are taking part in the Pine Gene Discovery Project, an initiative to identify and sequence the 50,000-odd genes in the pine tree’s genome Knowing which gene does what should make it easier to know what to alter. [br] What can we learn about the research on tree genes?
选项
A、The research methods are the same as the analysis of human genes.
B、The findings are expected to be as fruitful as the analysis of human genes.
C、It will take as much time and effort as the analysis of human genes.
D、The research has been mainly concentrated on the genes of young trees.
答案
A
解析
第2段末句中的similar efforts指的就是task of isolating and sequencing,即分析基因的常用方法,该句表明人类基因和树种基因的分析方法相同,但进展有差别,因此选项A为正确的推断。
转载请注明原文地址:https://tihaiku.com/zcyy/2917643.html
相关试题推荐
Ifyougodowntothewoodstoday,youmaymeethigh-techtrees—genetically
Ifyougodowntothewoodstoday,youmaymeethigh-techtrees—genetically
Ifyougodowntothewoodstoday,youmaymeethigh-techtrees—genetically
Ifyougodowntothewoodstoday,youmaymeethigh-techtrees—genetically
Ifyougodowntothewoodstoday,youmaymeethigh-techtrees—genetically
Ifyougodowntothewoodstoday,youmaymeethigh-techtrees—genetically
Ifyougodowntothewoodstoday,youmaymeethigh-techtrees—genetically
Ifyougodowntothewoodstoday,youmaymeethigh-techtrees—genetically
Ifyougodowntothewoodstoday,youmaymeethigh-techtrees—genetically
高科技产品high-techproduct
随机试题
Spending50minuteswithacellphoneclosetoyourearisenoughtochange
Smoking,whichmaybeapleasureforsomepeople,isaserioussourceofd
Humanity’sprimaleffortstosystematizetheconceptsofsize,shapes,andn
Ittookthreemonthsforthetwocompaniestoreachan(agree)_______.agreement动
液压缸和液压马达都是靠密封的工作空间的容积变化进行工作的。()
()指以少数学生为对象,在较短时间内尝试做小型的课堂教学,并摄制成录像
患者胸胁胀闷,嗳气食少,每因抑郁恼怒之时,发生腹痛泄泻,舌淡红,脉弦。其治法是A
下列哪种酶在糖酵解和糖异生中都有催化作用A.丙酮酸激酶 B.丙酮酸竣化酶 C
经典精神分析理论认为,()属于本我的特征。 (A)追求生物本能欲望 (B)
下列业务中,属于中央银行作为“政府的银行”所具有的基本职责的有( )。A.代理
最新回复
(
0
)