Abstract
Male sterility is regular in hybrids of race A and race B. Female sterility is analyzed, and indicates that the break-points of XR inversion lie to the right of compressed and to the left of javelin, respectively. The genetic isolation of race A and race B has progressed an additional step in the hybrids of certain strains where the [female][female] produce no or very few offspring. This is accomplished through interracial lethal genes connected with a maternal effect.

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