it involved nine "major or dominant" and ten modifying genes . 它有九對“主或顯性”基因和十對修飾基因。
it is quite easy to modify genes so that their encoded protein will be secreted, and there are also techniques for targeting proteins in the circulation to particular organs 很容易修飾基因,使它們所編碼的蛋白質能被分泌,也有技術使血液循環(huán)中的蛋白質打靶到特殊器官。
one example is maternal inheritance technology, in which modified genes pass down to only the seeds ( the maternal line ), not to the pollen ( the paternal side ) 方法之一是利用母性遺傳技術:經(jīng)過修飾的基因只會傳給種子(母系),而不會傳給花粉(父系);這項技術已經(jīng)在菸草、馬鈴薯及番茄等植物上進行了測試。