题干

现有甲、乙两种植物(均为二倍体纯种),其中甲种植物的光合作用能力高于乙种植物,但乙种植物很适宜在盐碱地种植,且相关性状均为核基因控制。要利用甲、乙两种植物的优势,培育出高产、耐盐的植株,有多种生物技术手段可以利用。下列所采用的技术手段中,不可行的是      (    )

A:利用植物体细胞杂交技术,可获得满足要求的四倍体杂种目的植株

B:将乙种植物耐盐基因导入到甲种植物的受精卵中,可培育出目的植株

C:两种植物杂交后,得到的F1再利用单倍体育种技术,可较快获得纯种的目的植株

D:诱导两种植物的花粉融合,并培育成幼苗,幼苗用秋水仙素处理,可培育出目的植株

上一题 下一题 0.0难度 选择题 更新时间:2018-11-02 03:44:31

答案(点此获取答案解析)

C

同类题5

Bobby was sitting out in his back yard in the snow. There were a few holes in his shoes. He thought hard, but he could not come up with an idea for his mother's Christmas gift.
Ever since his father had died three years ago, his mother worked nights at the hospital, but the small money she made could hardly be enough for their needs.
Although the family lacked in money and material things, they got more love in the family. The children ran the family when their mother was absent. All three of Bobby's sisters had already made beautiful gifts for their mother.
It was Christmas Eve already, and he had nothing. Bobby started to walk down to the street. He walked from shop to shop. Everything seemed so beautiful and so far away. It was getting dark. Suddenly he found a shiny dime (一角硬币) on the ground. Never has anyone felt so wealthy as Bobby did at the moment. It was enough to buy a rose with one dime.
He went inside a flower shop. When the owner asked if he could help him, Bobby took out the dime and asked if he could buy one flower. The shop owner looked at Bobby, then said, "You just wait here and I’ll see what I can do for you."
The shop owner returned holding a dozen of red roses in his hand. Bobby's heart sank (下沉) as the owner put them gently into a long white box. "That will be a dime, young man," said the shop owner, reaching out his hand for the dime. Slowly, Bobby moved his hand to give the man his dime.
Then the shopkeeper's wife appeared. "Where are the red roses?"
The shop owner said, "A strange thing happened to me this morning. I thought I heard a voice telling me to leave a dozen of my best roses for a special gift. When I saw that little boy tonight, I knew who that voice was."