期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1973
卷号：70
期号：7
页码：1950-1954
DOI：10.1073/pnas.70.7.1950
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：In genetic combinations undergoing ribosomal DNA magnification, the frequency of crossing-over between X and Y chromosomes is increased at least 20-fold above that in similar combinations not undergoing magnification. Such recombination occurs at the ribosomal DNA level. The data are consistent with a model where extra copies of ribosomal DNA are formed which, after circularization, are integrated into the chromosome.
关键词：genetic recombination ; frequency of crossing-over ; circularization ; integration
