Selective Differences between Males and Females in Drosophila robusta

Abstract

Drosophila robusta collected in a Southwest Virginia woods show seasonal changes in gene arrangement frequencies in several chromosomal arms. Most of these changes are significant in males but not in females. The gene arrangements of one arm show no seasonal changes but differ significantly in the two sexes. The data indicate that the selection pressures on carriers of these gene arrangements are probably not identical in males and females.