Comparison between rDNA magnification and bb lethal mutation frequencies in Drosophila melanogaster

✍ Scribed by Malva, C. ;La Volpe, A. ;Gargiulo, G.

• Publisher: Springer
• Year: 1980
• Tongue: English
• Weight: 453 KB
• Volume: 180
• Category: Article
• ISSN: 0026-8925
• DOI: 10.1007/bf00268054

✦ Synopsis

Unequal mitotic sister strand crossing over has been evoked to explain the occurrence of phenotypically bb+ males in the progeny of phenotypically bobbed males during magnification. If this is the case, complementary bbl loci should be obtained together with the bb+. To test this hypothesis we compared the frequency of bb lethal mutations in the sperms of bb males with the percentages of phenotypically bb+ males obtained during magnification of these bb males. We then compared these values with those occurring in phenotypically bb+ control males. We found that, while the number of bb+ males obtained during magnification, though variable, is high, the bb lethal mutation occurs at a very low frequency in all the genetic conditions, whatever the phenotype of the parental male.