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,理论上不可行的是(  )

A:利用植物体细胞杂交技术,有可能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甲种植物的受精卵中,有可能培育出目的植株

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

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后可能培育出目的植株

上一题 下一题 0.0难度 选择题 更新时间:2018-02-07 08:50:01

答案(点此获取答案解析)

C

同类题1

阅读理解

    Some people will do just about anything to save money.And I am one of them.Take my family's last vacation.It was my six­year­old son's winter break from school, and we were heading home from Fort Lauderdale after a week long trip.The flight was overbooked, and Delta, the airline, offered us $400 per person in credits to give up our seats and leave the next day.I had meetings in New York, so I had to get back.But that didn't mean my husband and my son couldn't stay.I took my nine­month­old and took off for home.

    The next day, my husband and son were offered more credits to take an even later flight.Yes, I encouraged — okay, ordered — them to wait it out at the airport, to “earn” more Delta Dollars.Our total take: $1,600.Not bad, huh?

    Now some people may think I'm a bad mother and not such a great wife either.But as a big­time bargain hunter, I know the value of a dollar.And these days, a good deal is something few of us can afford to pass up.

    I've made a living looking for the best deals and exposing(揭露)the worst tricks.I have been the consumer reporter of NBC's Today show for over a decade.I have written a couple of books including one titled Tricks of the Trade: A Consumer Survival Guide.And I really do what I believe in.

    I tell you this because there is no shame in getting your money's worth.I'm also tightfisted when it comes to shoes, clothes for my children, and expensive restaurants.But I wouldn't hesitate to spend on a good haircut.It keeps its shape longer, and it's the first thing people notice.And I will also spend on a classic piece of furniture.Quality lasts.