Abstract
Converging evidence from replicated hybrid analyses (and from selection and single-pair mating; Tully & Hirsch 1982) points to a single, major-gene correlate of the central excitatory state (CES) in pure breeding lines of the black blow-fly, Phormia regina. Analysis of reciprocal F 1s reveals no X-chromosome or cytoplasmic effects. Biometrical analysis indicates significant additive and environmental phenotypic variance components. No net dominance deviation or dominance variance is detectable (which is consistent with absence of intralocular dominance). An estimate of the number of segregating loci is near 1. A more general non-parametric method fails to reject the one-gene model.
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