TABLE 1.

Comparison of family sex-ratio distributions with simulated distributions from various sex-determination models

	Sex-ratio distribution of half-sib families (d.f. = 6)		Sex-ratio distribution of full-sib families (d.f. = 11)
Model	χ2	P-value	χ2	P-value
Polygenic, h2 = 0.62	2.07	>0.9	10.9	>0.4
One locus with environmental variance
p = 0.2	58.1	<0.001	171	<0.001
p = 0.4	59.6	<0.001	18.4	>0.05
p = 0.5	22.9	<0.001	6.2	>0.8
p = 0.6	14.8	<0.05	10.2	>0.5
p = 0.8	18.2	<0.01	28.1	<0.01
Two loci with environmental variance, p = 0.5	1.42	>0.9	12.6	>0.3
One locus without environmental variance	383	<0.001	865	<0.001
Two loci without environmental variance	23.9	<0.001	139	<0.001
Three loci without environmental variance	12.8	<0.05	63.3	<0.001
Five loci without environmental variance	6.33	>0.4	38.2	<0.001
Polygenic without environmental variance (h2 = 1)	8.04	>0.2	40.1	<0.001

P-value < 0.05 shows incompatibility between simulated and observed data. p, frequency of the male-orienting allele.