问答题假定有两对基因，每对各有两个等位基因Aa、Bb，以相加效应的方式决定植株的高度，纯合子AABB高50cm，纯合子aabb高30cm，问： 1)这两个纯合子之间杂交，F1高度是多少? 2)在F1×F1杂交后，F2中什么样的基因型表现为40cm高度?

问答题leucine zipper; zinc finger

问答题There is a marked difference between the education which every one gets from living with others and the deliberate educating of the young. In the former case the education is incidental; it is natural and important, but it is not the express reason of the association. (46) It may be said that the measure of the worth of any social institution is its effect in enlarging and improving experience, but this effect is not a part of its original motive. Religious associations began, for example, in the desire to secure the favor of overruling powers and to ward off evil influences; family life in the desire to gratify appetites and secure family perpetuity; systematic labor, for the most part, because of enslavement to others, etc. (47) Only gradually was the by-product of the institution noted, and only more gradually still was this effect considered as a directive factor in the conduct of the institution. Even today, in our industrial life, apart from certain values of industriousness and thrift, the intellectual and emotional reaction of the forms of human association under which the world's work is carried on receives little attention as compared with physical output. But in dealing with the young, the fact of association itself as an immediate human fact, gains in importance. (48) While it is easy to ignore in our contact with them the effect of our acts upon their disposition, it is not se easy as in dealing with adults. The need of training is too evident and the pressure to accomplish a change in their attitude and habits is too urgent to leave these consequences wholly out of account. (49) Since our chief business with them is to enable them to share in a common life we cannot help considering whether or not we are forming the powers which will secure this ability. If humanity has made some headway in realizing that the ultimate value of every institution is its distinctively human effect we may well believe that this lesson has been learned largely through dealings with the young. (50) We are thus led to distinguish, within the broad educational process which we have been so far considering, a more formal kind of education—that of direct tuition or schooling. In undeveloped social groups, we find very little formal teaching and training. These groups mainly rely for instilling needed dispositions into the young upon the same sort of association which keeps adults loyal to their group.

问答题自私DNA(selfish DNA)

问答题移码突变(frameshift mutation)

问答题原噬菌体

问答题为什么DNA双螺旋中维持特定的沟很重要?

问答题要识别刚孵出的小鸡的性别是很困难的，但是很容易区别它们的羽毛是芦花的还是非芦花的。设：

问答题IS元件整合到靶位点时会发生什么?

问答题上位效应

问答题intron; exon

问答题遗传学图

问答题标记基因

问答题简述质粒载体的结构与复制特征及其在分子生物学研究中的应用。

问答题Directions: You are planning to study in a foreign university. Write a letter of application to ask for some materials. Write to tell them 1) your educational background and 2) what major you want to study. You should write about 100 words on ANSWER SHEET. Do not sign your own name at the end of the letter. Use "Li Ming" instead. You don't have to write the address.

问答题原核生物

问答题Directions:Writeanessayof160-200wordsbasedonthefollowingdrawing.Inyouressay,youshould1)describethepictures,2)interpretthemeaning,and3)giveyourcomment.YoushouldwriteneatlyonANSWERSHEET2.

问答题三联体

问答题Directions:A.Studythefollowingsetofpicturescarefullyandwriteanessayinnolessthan160words.B.YouressaymustbewrittenclearlyonANSWERSHEET2.C.Youressayshouldmeettherequirementsbelow:1)Interpretthefollowingpictures,2)analyzepossiblereasons,and3)predictthetendencies.

问答题基因型