title: Synthesis of an attached autosome, C(3)RM, in Drosophila pseudoobscura.
abstract: Drosophila pseudoobscura has three acrocentric autosomes. In the experiments reported, homologous arms of the third chromosome were attached to the same centromere. This is a 'reversed metacentric compound' third chromosome, denoted by C(3)RM. This compound chromosome is relatively fertile in within-strain crosses (ca. 50% egg hatch) but sterile when outcrossed to a normal karyotype. When constructing translocations for this experiment, the behavior of the Y-autosome translocations suggested that this species can tolerate more Y chromosome deficiency while retaining fertility than can Drosophila melanogaster. Finally, there were no Robertsonian exchanges observed among the 96 autosome-autosome translocations analyzed cytologically.
authors.affiliation: Department of Entomology, University of California, Davis 95616.
authors.forename: L G
authors.initials: LG
authors.lastname: Harshman
authors.forename: T
authors.initials: T
authors.lastname: Prout
mesh_terms: D000818:Animals; D002875:Chromosomes; D004330:Drosophila / Q000235:genetics*