Table 3. Rescue of D. melanogaster/D. mauritiana hybrid male lethality by D. melanogaster Lhr⁻ deletions.

		No. of F1 hybrid females		No. of F1 hybrid males
Deletion tested	D. mauritiana male parent	Df/+	Balancer/+	Df/+	Balancer/+	Pharate adult	Estimated pharate male viability
l(2)k01209	Iso 105	54	35	0	0	4	7.4%
	W139	291	305	0	1	24	8.2%
Df(2R)BSC49	Iso 105	70	63	0	0	15	21.4%
	W139	142	35	0–3a	0–3a	0	0
Df(2R)BSC44	w f	47	44	0	0	0	0
	Iso 105	87	85	0	0	0	0
	W139	60	80	0	0	0	0
Other	various	6643	6589	12	8	0	0

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 X^mau/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,w^67c23; 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.