Table 2. Chi-square tests applied to the frequencies of dl and wt offspring from twelve backcrosses between dl/dl and dl/wt parents, with an expected 1∶1 ratio.

Family Number	#WT	#DL	Chi squared	p
1	94	61	7.03	0.008
2	6	7	0.077	0.782
3	8	6	0.28	0.593
4	90	49	12.1	0.001
5	39	33	0.5	0.48
6	88	69	2.3	0.129
7	21	24	0.2	0.655
8	88	91	0.05	0.823
9	41	33	0.865	0.325
10	43	31	1.95	0.163
11	28	43	3.17	0.075
12	86	81	0.15	0.699
13	12	14	0.154	0.695
14	38	34	0.222	0.637