The effects of heterozygous inversions on crossing-over in Drosophila ananassae

Abstract

1987. The effects of heterozygous inversions on crossing-over in Drosophila ananassae. Genome, 29: 802-805. Crossing-over was studied in females of Drosophila ananassae under different karyotypic combinations to detect the effects of heterozygous inversions by utilizing three recessive markers of the second chromosome. Because of the presence of a subterminal inversion (2L) in the heterozygous condition, crossing-over between the cu and b genes is completely eliminated. However, 2L heterozygosity enhances the level of recombination between the b and se genes. Furthermore, two third chromosome inversions when heterozygous also exert an enhancing effect on crossing-over in the second chromosome. These results provide evidence for the existence of intra-and inter-chromosomal effects of inversions on crossing-over in D.ananassae.

How chromosomal rearrangements shape adaptation and speciation: Case studies in Drosophila pseudoobscura and its sibling species Drosophila persimilis

“…Considering how little is mechanistically known in the model organism D. melanogaster, it is hard to speculate about other less studied species. Inversion heterozygosity suppresses recombination in the limited number of Drosophila species studied thus far (Carson, 1953;Dobzhansky & Epling, 1948;Singh & Singh, 1987), and does so via the same mechanisms, yet the relative strength and importance of these mechanisms is unknown (Krimbas & Powell, 1992b). Given that both recombination maps and crossover interference are known to vary between species, it is reasonable to expect the magnitude and extent of recombination suppression to differ as well (Brand, Cattani, Kingan, Landeen, & Presgraves, 2018;Cáceres, Ranz, Barbadilla, Long, & Ruiz, 1999;True, Mercer, & Laurie, 1996).…”