Tandem duplications in Drosophila melanogaster: III. Intrachromosomal exchange of a heterozygous tandem duplication

Radiation induced tandem duplications in Drosophila melanogaster.

T H I S paper reports the successful induction by X rays of two tandem direct duplications for the lozenge region of the X chromosome of Drosophila. Numerous tandem direct duplications (ABAB) of spontaneous origin are now known in Drosophila: Bar, STURTEVANT (1925), MULLER, PROKOFYEVA-BELGOVSKAYA and KOSSIKOV (1936) and BRIDGES (1936); Hairy wing, DEMEREC and HOOVER ( 1939) ; Dp (2: 2) Star, LE...

Exchange within heterozygous inversions in Drosophila melanogaster.

The exchange behavior of non-attached, whole arm, X chromosome inversions was reexamined using nondisjunction in XXY females as an indirect measure of the frequency of nonexchange tetrads. Crossing over is quite normal in these inversion heterozygotes and is independent of the arrangement of the basal heterochromatin.

Properties and evolutionary potential of newly induced tandem duplications in Drosophila melanogaster.

Most of some 33 X-ray-induced duplications recovered as Suppressors of Minute loci proved to be direct tandem duplications. When heterozygous, most duplications were crossover suppressors, and duplications of short to moderate size did not reduce the fitness of their bearers. Crossover suppression by tandem duplication may be attributed to intrastrand foldbacks of the type regularly seen in som...

A tandem duplication that lowers recombination throughout a chromosome arm of Drosophila melanogaster.

Tandem genetic duplications in phage and bacteria.

SELECTION OF TANDEM DUPLICATIONS .................................................................. 478 Gene Dosage .............................................................................................................. 478 Coinheritance of Allelic Markers ............................................................................ 485 Operon Fusion ..... ............................... ...