Abstract
Ring chromosomes are of basic interest to the geneticist and cell biologist who study their behavior in meiotic and mitotic divisions. In addition, the mitotic instability associated with some ring-X chromosomes has proven useful in Drosophila as a means to produce gynandromorphs for developmental studies. We describe a method to construct ring-X chromosomes in Drosophila via I-CreI-mediated exchange in rDNA, and then rapidly diagnose the recovery of ring chromosomes via FLP-mediated sister chromatid exchange within the ring. The method we describe provides a ready means to tailor the genetic content of ring-X chromosomes, making it suited to produce ring-X chromosomes for a variety of experimental purposes.
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