Fig. 2. Variability in the estimates of gene effects at Locus 1. Gene effects were expressed in terms of three orthogonal contrasts for the: testcross additive effect of Group 1 alleles (diamond); testcross additive effect of Group 2 alleles (circle); and dominance effect (triangle). The trait was controlled by 10 or 100 loci, of which 10% were known. Trait heritability was 20% and gene effects were estimated from 2000 tested hybrids

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