题目内容

Male sterility maintenance line

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Episome

Intron and exon

上海奶牛的泌乳量比根塞(Guernseys)牛高12%，而根塞牛的奶油含量比上海奶牛高30%。泌乳量和奶油含量的差异大约各包括10个基因位点，没有显隐性关系。在上海奶牛和根塞牛的杂交中，F2中有多少比例的个体的泌乳量和上海奶牛一样高，而奶油含量和根塞牛一样高

The cultured E. coli system was infected by two types of bacteriophages. One type is a-b-, another is a+b+. Then the lysate was sampled and smeared on medium. The data of the bacteriophage growth by counting plaques is as follows: a+b+=4750, a+b-=370, a-b+=330, a-b-=4550. How much is the recombination rate between a and b ______

A. 70%
B. 12.8%
C. 7%
D. 15%