Figure 1

The diallel crossing scheme represented at each thermal treatment: a) 27°C and b) 23°C. Eight lines were crossed to each other in all combinations, barring the inbred combinations (female lines vertically, male lines horizontally). Cells shaded grey indicate those crosses that were duplicated, and hatched cells represent crosses without replication. The number of females versus males subsequently scored for fitness traits per cross are indicated within each cell. For example, in cross Dam 4A × Sire 1B at 27°C, 7 females and 9 males were sampled, with this cross not replicated (represented by the hatched cell).