Transposon tagging can work. Even though most of our understand ing about the factors that contribute to a successful tagging experiment has been accumulated from a limited number of experiments using different transposable elements in different genetic backgrounds, it is still possible to draw some conclusions regarding the best experimental strategies for gene tagging. In our experience, Spm has proved to be a good element for transposon tagging. The frequency of recovering mutable alleles in duced by Spm is not significantly different from that for Ac-Ds or for Mu 6 (summarized in Ref. 22) and varies from about 10- to 10=zr:-8pm has the unique advantage, however, in that all of the members of thiSfumily that have been examined thus far are homologous to each other at the DNA level. Therefore, by combining molecular analysis with genetic segre gation, it is possible to identify and isolate alleles that are due to insertions of either autonomous or nonautonomous Spm elements. There are definite steps one can take to increase the chances of de tecting a transposition into the gene of interest. The most important step is to select a genetic background in which the desired phenotype will be easy to screen. If the phenotype is not likely to be mutable, then tester lines should be constructed so as to contain flanking markers that can aid in subsequent segregation analyses.
DISCUSSION The LPS that is normally present on the surface of S. typhimurium apparently acts as a partial barrier to the ... of the earlier work on this project , and to J. R. Roth and P. E. Hartman for helpful discussions and strains .
MUSEUMS The following is a list of museums with film programs , compiled from the Official Museum Directory ( Washington , D.C .: American Association of Museums , 1975 ) . Check the " Weekend ” section on Friday in The Washington Post ...
Principles of Medical Genetics
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基因改造,可以剔走色盲、不育、腫瘤和肌肉萎縮等疾病,是重要發明! 基因改造成功了,可以產生健康又長壽的特種新人類, ...
Explains the science behind modern treatments. Examines the impact on society and discusses the moral issues at stake.
为了解决这个问题,张进团队在“鸡蛋”还没有受精前进行细胞核移植,这种做法从技术上看是领先的,同时从伦理道德上也相对容易被接受。具体操作过程为,医生先移除Shaban的卵子原核,再植入同被去除卵子原核的捐赠者卵子内,然后授精。张进团队以这种方法, ...
This third edition of Human Molecular Genetics continues to provide a clear introduction to this complex and fast moving field. Now updated and revised throughout, the material covered...
Key Benefit: Known for its focus on problem-solving, conceptual understanding, and practical applications, this best-seller is 32 pages shorter than its previous edition. New features of the Seventh Edition...
The genetics revolution that began with the discovery of DNA fifty years ago has transformed the science of biology. It has given us unprecedented power over life itself in the...