作业帮关于转基因食品是否被允许进入我国销售的120词带翻译的高中英语作文
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/14 01:25:30
关于转基因食品是否被允许进入我国销售的120词带翻译的高中英语作文
Traditional plant breeding involve s crossingvarieties of the same species in ways they could cross naturally．For example,disease－resistant2) varieties of wheat have been crossed with high－yield wheat to combine theseproperties．This type of natural gene exchange is safe and fairly predictable3)．
Genetic engineering（GE）involves exchanging genes between unrelated species that cannotnaturally exchange genes with each other．GE can involve the exchange of genes betweenvastly different species――e．g．putting scorpion4) toxin5) genes into maize6) or fishantifreeze7) genes into tomatoes．It is possible that a scorpion toxin gene,even when it isin maize DNA,will still get the organism to produce scorpion toxin――but what othereffects may it have in this alien environment?We are already seeing this problem――addinghuman growth hormone genes to pigs certainly makes them grow――but it also gives themarthritis and makes them cross－eyed,which was entirely unpredictable．
Genetic engineering（GE）involves exchanging genes between unrelated species that cannotnaturally exchange genes with each other．GE can involve the exchange of genes betweenvastly different species――e．g．putting scorpion4) toxin5) genes into maize6) or fishantifreeze7) genes into tomatoes．It is possible that a scorpion toxin gene,even when it isin maize DNA,will still get the organism to produce scorpion toxin――but what othereffects may it have in this alien environment?We are already seeing this problem――addinghuman growth hormone genes to pigs certainly makes them grow――but it also gives themarthritis and makes them cross－eyed,which was entirely unpredictable．