Table 2.

The total observed (O) and expected (E) numbers of heterozygotes and homozygotes for the four types of matings that potentially segregate for homozygotes and the estimated selective difference between heterozygotes and homozygotes

Locus	Female × Male	Heterozygotes		Homozygotes		χ2	s
		O	E	O	E
HLA-A	AiAj  ×  AiAk	169	151.50	33	50.50	8.08**	0.418
	AiAi  ×  AiĀi	39	38.50	38	38.50	0.01	(0.050)
	AiĀi  ×  AiAi	34	26.50	19	26.50	4.25*	0.457
	AiAj  ×  AiAj	56	40.00	24	40.00	12.80***	0.579
	Total	298	256.50	114	155.50
HLA-B	AiAj  ×  AiAk	140	132.75	37	44.25	1.58	(0.213)
	AiAi  ×  AiĀi	36	33.00	30	33.00	0.54	(0.189)
	AiĀi  ×  AiAi	37	26.00	15	26.00	9.31**	0.605
	AiAj  ×  AiAj	55	41.50	28	41.50	8.78**	0.500
	Total	268	233.25	110	144.75

Values of s are given in parentheses when χ² was not significant. ∗, P < 0.05; ∗∗, P < 0.01; ∗∗∗, P < 0.001.