Table 1.

Results from in situ hybridization of hairy probe to three species of Drosophila

Species	Interval, hr	Proportion				Sample size	Total
		Stage 1	Stage 2	Stage 3	Stage 4
Mel	2.5–3.0	0.778	0.050	0.040	0.131	125	125
Mel	3.0–3.5	0.133	0.133	0.553	0.181	67, 49, 143	259
Mel	3.5–4.0	0.153	0.019	0.230	0.598	70, 54, 65, 75	264
Sim	1.5–2.0	0.787	0.066	0.131	0.016	65, 116	181
Sim	2.0–2.5	0.773	0.114	0.045	0.068	46	46
Sim	2.5–3.0	0.558	0.165	0.234	0.043	122, 102, 120, 89, 90, 31, 104	658
Sim	3.0–3.5	0.038	0.031	0.436	0.495	86, 75, 94, 55, 114, 141	565
Sim	3.5–4.0	0.000	0.005	0.039	0.956	203	203
Pse	2.0–2.5	0.992	0.000	0.000	0.008	125	125
Pse	2.5–3.0	0.866	0.040	0.075	0.019	99, 100, 134	333
Pse	3.0–3.5	0.801	0.106	0.031	0.062	107, 105, 121	333
Pse	3.5–4.0	0.063	0.003	0.766	0.167	116, 52, 121, 174, 113, 73	649
Pse	4.0–4.5	0.037	0.000	0.117	0.846	126, 77, 95, 81, 139	518

Numbers indicate relative proportions. “Sample size” lists each batch of in situ hybridizations. “Total” column sums the samples. All numbers reflect measurements after removal of outliers from upper and lowr 10% of samples. Mel, D. melanogaster, Sims, D. simulans, and Pse, D. pseudoobscura. Intervals are hours since egg deposition was measured at 25°C. Stage 1, no expression; stage 2, partial expression; stage 3, full expression; stage 4, morphogenesis.