On Mendelian Dominance and the Serial Order of Phenotypic Effects in the Bar Series of Drosophila melanogaster

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Abstract
In the bar-eyed series, infrabar and double infrabar show a positive relative rate of change in facet number with increase in temp. and so stand in contrast to bar and ultrabar which show a negative relative rate of change in facet number with increase in temp. The heterozygotes are similar to bar and ultra-bar in this respect. On the basis of data in the literature, it is pointed out that bar in the short space of 10[degree] C. passes from complete recessiveness near 17[degree] to almost complete dominance at 27[degree] in relation to infrabar. Below 17[degree] there is a heterosis-like effect of infrabar on facet number. Since the serial order of the genetic differences on the basis of the phenotypic effect varies with the temp., any theory on the nature of dominance or on the nature of the alleles which rests on such a serial order is consequently defective. Such irregularities in the serial arrangement of the genetic differences may be obviated by a serial order in terms of the 1st derivative of the function describing the facet/temp. relation.

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