Rescue of D. melanogaster/D. mauritiana hybrid male lethality by D. melanogaster Lhr− deletions.

D. melanogaster females with the designated deletions were mated to D. mauritiana males at 18°. The small number of live males recovered are likely patroclinous exceptions, that is Xmau/O. Pharate adults were scored after all adults had eclosed. “Estimated pharate male viability” was calculated as number of pharate adult males/number of Df/+ females. For crosses with l(2)k01209, pharate adult males displayed the orange-eye color characteristic of Df/+. For crosses with Df(2R)BSC49, the genotypes of the pharate adults could not be determined and were thus assumed to be Df/+. Full genotypes of Lhr− deletions are: y1,w67c23; P{w+mC = lacW}l(2)k01209[k08901a]/CyO; Df(2R)BSC49/SM6a; and Df(2R)BSC44/SM6a. All three were previously shown to be deleted for Lhr[16]. “Other” refers to 45 different Lhr+ deletions spanning chromosome arm 2R.aCross produced 3 total males, which were not genotyped for Df or balancer.