单项选择题

Pedigree method or somatic cell hybridization can be used to map human chromosome genes. When the former is used to do chromosome mapping ______.

A．X chromosome linked genes are easier than somatic genes
B．X chromosome linked genes are more difficult than somatic genes
C．X chromosome linked genes are as easy as somatic genes
D．All the above statements are incorrect because the data of pedigree method is unable to be used in chromosome mapping
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单项选择题
A female-male mosaic fruit fly may be formed, if there is chromosome loss or ______.
A．equal division during sperm generation
B．abnormal mitosis during merogenesis (fertilized egg cleavage)
C．meiosis in embryo
D．meiosis when sperm is tailed
单项选择题
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%
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