Abstract
This paper presents a study of vigor in races, and the inbred and outcrossed "homozygous" lines which may be formed from them. Egg production in Drosophila melanogaster is used as the criterion of vigor. The results show that inbreds from continued brother by sister pair matings may retain some of their genes in heterozygous condition over many generations. "Homozygous" lines, formed by outcrossing, in general show lower yields than the inbreds from which they originated. This observation Would agree with the hypothesis that the cause of hybrid vigor lies in differences in genie interaction between alleles and their reaction products. This result would not be expected, in fact, it should be in the other direction, if the cause of hybrid vigor lay in some, as yet unidentified, physiological stimulation resulting from the union of unlike gametes.
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