The Description of Genic Interactions in Continuous Variation

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Abstract
The phenotypic effect of a gene can be described in terms of 6 parameters which include the expression of digenic interaction. More parameters are required for extension to trigenic and higher order interactions. The effects of digenic interaction on means, variances, co-variances and scaling tests derivable from the backcrosses, F2, F3 and third generation biparentai progenies of a cross between two true breeding lines are analysed and shown to be usefully expressible in terms of interaction parameters. The use of scaling tests and of the second degree statistics in detecting digenic interactions is considered, and it is shown how the effect of interaction may be separated from that of linkage in the second degree statistics obtainable from F2 and F3.