FURTHER DATA ON Y CHROMOSOME TYPES INDROSOPHILA ATHABASCA

Publisher Website
Google Scholar
Abstract
The 3 major Y chromosome types of Drosophila athabasca are as follows: Type 1, a large J-shaped chromosome; Type 2, a small near-V; and Type 3, a large V, accompanied by a morphologically similar X1 chromosome and a rod-like X2 that appears homologous to the 4th chromosome of other D. athabasca. Type 1 has been found alone in the west (Alaska, Yukon Territory, British Columbia, Wyoming, and Colorado) and sometimes accompanied by other types in the eastern part of the species'' range (Minnesota, Wisconsin, Michigan, Pennsylvania, Maine, and Quebec). Type 2 occurs in Minnesota, Michigan, Ohio, Ontario, Quebec, Pennsylvania, and North Carolina. Type 3 has been found in Minnesota, Michigan, Ohio, New York, Massachusetts, Pennsylvania, and North Carolina. A single wild male from Duluth, Minnesota, possessed a large V-shaped Y similar to Type 3 except for being accompanied by only an ordinary large V-shaped X (1. e. no X2 ); this sort has been called Type 4. Strains differings as to Y type are sometimes capable of crossing and producing hybrids, and these are sometimes fertile. This is especially well established for the widely coexisting Types 2 and 3 of the eastern United States.