问题 问答题

某个转基因载体结构,卡那霉素抗性选择标记基因旁边紧密连锁着目的基因(抗冻基因)。用该结构转化烟草叶片,筛选抗卡那霉素的叶片细胞再生植株,即为T0代转基因植株。T0代转基因植株开花结果,即得T1代种子。问:

如果T1代种子中观察到抗卡那霉素和不抗卡那霉素的分离比为15:1,请问植物染色体上有几个位置插入了外源基因

答案

参考答案:2个位点插入了外源基因,且位于非同源染色体上

解答题
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Sometimes willpower is a lot like the television remote control — hard to find just when you want it most. Whether you’re trying to lose weight, stop smoking, get to the gym regularly,developing your sense of willpower is an important part of changing any behavior. ___小题1:__. But there are ways to increase your willpower.

Don’t try to change your economic situation, win a promotion and lose weight all on the same morning. Establish one clear, specific goal and make a realistic plan for achieving it. Extra willpower sometimes requires extra energy, so don’t stretch yourself too thin. __小题2:__.

Whatever your goal is, don’t expect to achieve it overnight. __小题3:__ . If you are trying to kick a caffeine habit, start by replacing your morning cup of coffee with a glass of water, instead of vowing never to drink coffee again. Congratulate yourself on the small achievements that will pave the way toward a larger one. These successes help your willpower grow.

__小题4:__. Ask friends, family or colleagues for assistance and tell them exactly how they can help. If your credit card bills have increased sharply, for instance, let friends know that you are cutting back on expenses. Suggest having a common dinner instead of meeting at an expensive restaurant. Find a support group or organization related to your goal and attend their meetings. You can get valuable advice, understanding and information.

If possible, change your environment to encourage positive behavior. Want to get in shape? Keep an extra set of workout clothes in your office as a reminder to stop by the gym on the way home. Quitting smoking? __小题5:__.

A.Change your environment to change your life

B.Real success takes time.

C.Avoid bars or restaurants where you might be attracted to light up.

D.Changing your behavior requires more than willpower.E. Improve your willpower by a support network.

F. Breaking a bad habit or forming a new and healthy one can be difficult.

G. Focus on one goal at a time.