Advantages and disadvantages of genetic engineering?

Question 1: Advantages and disadvantages of genetic engineering increase gene diversity.

Question 2: What do you think of the advantages and disadvantages of genetic engineering? 10 has advantages and disadvantages, depending on how you use it. In some respects, the means of genetic engineering have indeed played an irreplaceable role; But from another point of view, genetic engineering should have long-term observation in food, breeding and other aspects, and can't be eager for quick success!

Question 3: What are the advantages and disadvantages of genetically modified engineering? Transgenic technology is one of the important fields in the frontier of life science. Since humans planted crops, our ancestors have never stopped genetically improving crops. In the past thousands of years, the main way to improve crops is to select and use excellent genes and recombinants produced by natural mutation, and accumulate excellent genes through random and natural methods. On the basis of genetics, animal and plant breeding in the past hundred years has adopted artificial hybridization to recombine excellent genes and introduce foreign genes to realize genetic improvement. Therefore, it can be considered that transgenic technology and traditional technology are in the same strain, and its essence is genetic improvement by obtaining excellent genes. However, there are two important differences between transgenic technology and traditional breeding technology in the scope and efficiency of gene transfer. First, traditional technology can only realize gene transfer between individuals within a species, while the genes transferred by transgenic technology are not limited by the genetic relationship between organisms; Secondly, the traditional hybrid selection technology is generally carried out at the individual level, and the object of operation is the whole genome, which transfers a large number of genes, so it is impossible to accurately operate and select a certain gene, and the performance of offspring is poor. Transgenic technology is generally to manipulate and transfer clearly defined genes, with clear functions, and the performance of future generations can be accurately expected. Therefore, transgenic technology is the development and supplement of traditional technology. The close combination of the two can complement each other and greatly improve the efficiency of animal and plant variety improvement.

The original intention of scientists to invent transgenic technology is to use it to benefit mankind, which can not only accelerate the improvement of crops and livestock varieties and improve the quality of human food, but also produce precious medicinal protein and bring good news to patients. For example, insect-resistant transgenic corn will not be bitten by insects, which can make people feel safe to eat; By transferring genes that can produce human vaccines into plant foods, people can increase their resistance to diseases while eating food.

However, will human intervention in nature cause potential and unpredictable dangers? Will a large number of genetically modified organisms destroy biodiversity? Will genetically modified products do harm to human health? Some scientists began to worry about the "arbitrary modification" of biological and plant life, and the creation of new genetic genes and organisms may harm human beings. They may cause new pollution to the ecological environment, so-called genetic pollution, which is difficult to eliminate. In addition, the effects of genetically modified crops and genetically modified foods made from this raw material on human body have not yet been determined.

At present, scholars at home and abroad have also done a lot of research on the negative effects of transgenic technology, and many related reports have appeared. For example, the authoritative British science magazine Nature published John, an associate professor at Cornell University. A paper by Rosie shocked the world. The paper points out that the researchers spread the pollen of insect-resistant transgenic corn "BT corn" on the leaves of chicory in the laboratory, and then let butterfly larvae eat these leaves. Four days later, 44% of the larvae died, and the surviving larvae were smaller and lifeless. However, the other group of larvae did not have high mortality or developmental retardation when eating leaves sprinkled with ordinary corn pollen. Based on this, the paper concludes that the pollen of BT transgenic corn contains toxins. It is also reported that the experimental report of the British Center for Ethics and Toxicity said that compared with ordinary soybeans, isoflavones, an anticancer component in herbicide-resistant transgenic soybeans, were reduced. Compared with common soybean, the isoflavone content in two transgenic soybeans decreased by 12% ~ 14%, and Brazil nut incident occurred.

In the face of international disputes about genetically modified crops, many scientists and academic groups have expressed their support for transgenic technology in various forms. The Statement of Scientists Supporting Agricultural Biotechnology, drafted by prakash, a professor at Taskey Jida University in the United States, in June 5438+October 2000 10, collected the signatures of more than 3,000 scientists around the world, including James Watson, the discoverer of DNA double helix structure and Nobel Prize winner, Norman Borlaug, the founder of Green Leather House, and won the World Food Prize. & gt

Question 4: What should I do if my menstrual period is too long? 1. Take Chinese medicine or Wuji Baifeng pills.

Be careful not to eat anything cold or spicy.

Pay attention to rest and don't do strenuous exercise.

4. Eat more high-protein or blood-enriching things.

If you haven't menstruated yet, you can take some medicine first to prevent it from taking too long.

Question 5: What advantages and disadvantages will genetic engineering bring to human beings? Human beings have made great progress in the field of genes, and made rapid progress in changing nature through genetic engineering to serve human needs. However, for a long time, human beings have not paid enough attention to the philosophical and ethical aspects of genetic engineering. From cloning technology to the great discovery of human genome, this problem has become increasingly prominent, but compared with this process, the corresponding social ethics system of human beings has not been established. As far as its content is concerned, genetic ethics can be divided into two aspects, one is ecological ethics, the other is social ethics. As far as the ecological ethics of genes is concerned, it is mainly to standardize and coordinate the contradiction between genetic engineering and ecological environment; As far as the social ethics of genes is concerned, it is mainly to standardize and coordinate the contradiction between genetic engineering and social ethics. The establishment and development of genetic ethics will not only hinder the development of natural science, but also further improve our understanding of the nature of science and help us to have a new understanding of truth, law and causality. Human beings have made great progress in the field of genes, and made rapid progress in changing nature through genetic engineering to serve human needs. However, for a long time, human beings have not paid enough attention to the philosophical and ethical aspects of genetic engineering. There are two problems. On the one hand, under the philosophy of transforming and conquering nature, genetic engineering has caused many ecological problems, especially biodiversity, which is the basis of natural sustainable development. On the other hand, genetic engineering has caused many social and ethical problems. From cloning technology to the great discovery of human genome, this problem has become increasingly prominent, but compared with this process, the corresponding social ethics system of human beings has not been established. As far as its content is concerned, genetic ethics can be divided into two aspects, one is ecological ethics, the other is social ethics. As far as the ecological ethics of genes is concerned, it is mainly to standardize and coordinate the contradiction between genetic engineering and ecological environment; As far as the social ethics of genes is concerned, it is mainly to standardize and coordinate the contradiction between genetic engineering and social ethics. The normative and reasonable restriction of ecological ethics on plant gene research is mainly due to the consideration of biodiversity. In recent years, great progress has been made in plant gene research, which has promoted a series of agricultural revolutions, especially the grain revolution. However, this revolution based on plant genetic optimization has led to the destruction of species diversity. For example, it makes people eat more than 5000 kinds of grain to 150 kinds. Similarly, chemical fertilizer has played an important role in increasing production and shortening growth period, but it has also caused soil hardening and surface damage. The same situation also occurs in the research and application of animal genes. For example, test-tube cows and test-tube sheep provide a basis for people to control biological sex, and this technology makes it possible for people to control biological populations. For a certain group of people, the number of men is small, but the number of women is very important. According to the laws of nature, the birth probability of men and women is roughly the same. Therefore, how to maximize the number of women and reduce the number of men at birth is very critical. But in this way, it will inevitably lead to the imbalance of the proportion of male and female species, thus causing the imbalance of natural ecology. When this technology is applied to humans, the problem is even bigger. Some time ago, the discussion on cloning technology showed that once gene cloning technology is used in human beings, it may bring or even cause troubles beyond our imagination. So, does gene ethics contradict gene technology and genetic engineering? Obviously not, because genetic ethics and genetic technology are completely consistent in serving mankind. Both of them require us to make full use of gene technology to benefit mankind and try our best to avoid all phenomena harmful to society. Only in different countries and regions, the degree and proportion of the two are different. For a developing country like China, the key point is not how to overcome the negative effects of genetic engineering, but how to make the best use of genetic engineering and genetic technology to develop the economy. For example, we all know that biodiversity is the basis of the sustainable development of nature, that is to say, biological evolution is not based on "survival of the fittest", but the cooperation of advantages and disadvantages, which is a diversified process, and optimization is bound to be monotonous. However, at present, genetic engineering is mainly about selecting the best among the best, which obviously runs counter to the direction of biodiversity and has indeed led to such problems in practice. However, for developing countries, this has solved many very difficult practical problems. Therefore, the establishment and development of genetic ethics will not only hinder the development of natural science. & gt