ROSOPHILA PAULISTORUM is a superspecies composed of five semispecies (the Centroamerican, Amazonian, Andean, Orinocan, and Interior), and a heterogeneous group of Transitional populations (DOBZHANSKY, PAVLOVSKY and EHRMAN 1969; SPASSKY et al. 1971 ) . External morphological, physiological, and ecological differences between the semispecies are too small to be of use in distinguishing the semisp...

An appreciable fraction of the Drosophila melanogaster genome is dedicated to male fertility. One approach to characterizing this subset of the genome is through the study of male-sterile mutations. We studied the relation between vital and male-fertility genes in three large autosomal regions that were saturated for lethal and male-sterile mutations. The majority of male-sterile mutations affe...

BACKGROUND AND AIMS Dioecism characterizes many crop species of economic value, including kiwifruit (Actinidia deliciosa). Kiwifruit male sterility occurs at the microspore stage. The cell walls of the microspores and the pollen of the male-sterile and male-fertile flowers, respectively, differ in glucose and galactose levels. In numerous plants, pollen formation involves normal functioning and...

BACKGROUND Area-wide integrated pest management strategies that include a sterile insect technique component have been successfully used to eradicate tsetse fly populations in the past. To ensure the success of the sterile insect technique, the released males must be adequately sterile and be able to compete with their native counterparts in the wild. METHODOLOGY/PRINCIPAL FINDINGS In the pre...