Fig. 1From: Association of zygotic piRNAs derived from paternal P elements with hybrid dysgenesis in Drosophila melanogasterGD phenotypes of the F1 and F2 hybrids from the P-, M′- and Q- strain males (a) Schematic representation of the experimental design for crosses. The test males (a) of the four line were crossed with the M-CS females to obtain F1 females (b), which were then crossed with P-Har males to obtain F2 females (c). b GD scores of F1 and F2 hybrids. Ovaries of approximately 50 (F1) and 100 (F2) flies were investigated to score the GDBack to article page