BIOMETRICAL ANALYSIS WITH TWO OR THREE GENE LOCI

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Abstract
A linear combination model proposed by Seyffert (1966) has been applied for estimating the first-degree genetic parameters specifying additive, dominance and epistatic effects of two and three gene loci affecting quantitatively inherited characters. Using the data from some recently published reports, it has been found that a large part of epistatic gene action remains undetected by the standard biometrical techniques like factorial and diallel methods of analysis. These methods usually tend to overestimate the role of additive gene action in the inheritance of metrical characters. It is suggested that characters with less complex biological causes of variation tend to show more additive genetic effect than relatively more complex traits.