TABLE 1.

Progeny counts from the eight primary classes shown in Figure 1B

Deletion size in bpa	IDb	Directionb	Single-male crosses	A	B	C	D	A′	B′	C′	D′
0	50C	None	85	2,570	1,792	1,591	2,640	433	254	209	422
3,840	49	Proximal	79	1,510	1,532	1,480	2,040	91	37	35	78
6,848	81	Proximal	47	1,549	1,082	1,050	1,937	99	102	88	147
7,582	85	Proximal	75	1,256	1,074	1,179	1,630	99	118	100	108
10,160	102	Proximal	80	2c	2,158	2,236	3,040	26	23	24	44
10,931	45	Proximal	47	28c	827	439	1,089	25	88	57	125
42,645	36	Distal	114	4c	2,915	2,503	3,690	4	357	305	195
210,463	38	Distal	239	0	7,205	6,030	9,067	0	666	500	394

^aDeletion lengths are based on a standard reference sequence and will vary slightly with stock.

^bAbbreviations for deletion chromosome names and directions are as reported (Preston et al. 1996). Standard nomenclature would be, e.g., Df(2R)50C-49.

^cThe chromosomes with 10-, 11-, 43-, and 210-kb deletions are missing one or more essential genes encompassed by the deletion. Therefore, most individuals in category A do not survive from those crosses. A few exceptions were expected, however, resulting from coincidental occurrence of both gap repair and P-element transposition to place a copy of the P{w*} element on one of the other paternal chromosomes. We tested 20 of these exceptions by PCR similar to the test done for category A′ and confirmed that gap repair had occurred in each case.