Abstract
We report here the genetical and X chromosome rDNA molecular study of two Drosophila melanogaster Oregon R lines. These lines differ extensively in the degree of resistance of the females both to the lethal effect of an increased temperature and to that of Bacillus thuringiensis beta-exotoxin, which is an inhibitor of the nucleolar RNA polymerase. The 3B line, whose females are resistant, came from an Oregon R population subjected over several generations to increased temperature, 28 degrees C or over, while the other line is derived from the initial stock. Twofold variation was observed in the total number of ribosomal genes between the two lines. This variation applied to most ribosomal units, including the active ones. Variations among X chromosome rDNA content in a wild type population have thus been revealed using tests of resistance to the Bacillus thuringiensis beta-exotoxin. Additive variations in specific unit types between the two lines indicate that modifications to the rDNA content are not rare events.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
