【网络综合 - 英语资源】
一直以来，转基因食品都被炒得沸沸扬扬。赞美者有之，诋毁者有之，怀疑者有之。那么，食用转基因食品会安全吗？我们看看下文的解释吧。 Traditional plant breeding involves crossing varieties of the same species in ways they could cross naturally. For example, disease-resistant varieties of wheat have been crossed with high-yield wheat to combine these properties. This type of natural gene exchange is safe and fairly predictableㄝ
Genetic engineeringㄗGEㄘinvolves exchanging genes between unrelated species that cannot naturally exchange genes with each other. GE can involve the exchange of genes between vastly different species求e.g. putting scorpion toxin genes into maize or fish antifreeze genes into tomatoes. It is possible that a scorpion toxin gene, even when it is in maize DNA, will still get the organism to produce scorpion toxin求but what other effects may it have in this alien environment? We are already seeing this problem求adding human growth hormone genes to pigs certainly makes them grow求but it also gives them arthritis and makes them cross-eyed, which was entirely unpredictableㄝ
It will be obvious, for example, that the gene for human intelligence will not have the same effect if inserted into cabbage DNA as it had in human DNA求but what side-effect would it haveˋIn other words, is GM food safe to eatˋThe answer is that nobody knows because long-term tests have not been carried out.
Companies wanting a GM product approved in the UK or USA are required to provide regulatory bodies with results of their own saf
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