Gene Relationships in Two Species of Mice with Reference to Their Possible Evolutionary Significance

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Abstract
The results obtained in crossing Mus bactrianus with strains of M. musculus carrying a number of recessive genes indicate that the wild-type complex is similar in the 2 species since the normal genes of either species were equally dominant over the corresponding recessive alleles of musculus. Certain musculus dominants, however, were less dominant over the normal alleles of bactrianus than of musculus, demonstrating the presence of somewhat different modifying genes in the 2 spp. and the dependence of the expressivity of such dominant genes on the residual heredity of the zygote.

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