[Age-related changes in crossing over in Drosophila resemble the picture of interchromosomal effect of chromosome rearrangement on crossing over].

Crossing over in the left arm of chromosome 2 (2L) was studied in successive broods of Drosophila melanogaster females carrying intact chromosomes (+/+), inversion Muller-5 in the X chromosome (M-5/+), and insertion of the Y-chromosome material into region 34A (Is(2L)/+). The regions net-dp, dp-b, b-pr and pr-cn were examined in 14 two-day-old broods of females +/+ and M-5/+ and in 10 broods of females Is(2L)/+. In all lines, the highest level of crossing over was in the first three broods (eggs laid during the first 6 days of oviposition) and the lowest level in the broods 7-8 (eggs laid at days 14-16).

[Generation of Y-chromosome insertions into left arm of chromosome 2 of Drosophila melanogaster].

An experimental procedure describing production of insertions of Y-chromosome material into autosomes of Drosophila is presented. Irradiated Y;2 translocations served as source material. The insertion selection scheme was based on the emergence of additional progeny classes in the case of independent segregation of the detached fragments of the Y chromosome and autosome.

[Chromosome rearrangement: two ways of influencing crossing over in Drosophila].

Insertion of the Y-material into the 34A Is(Y;2L)419 region diminished recombinational length of the left arm of chromosome 2 (2L) from 49.1 to 15.0 cM.