Abstract
Hybrids between Japanese waltzing mice and the common house mouse surpass both parents in vigor, fertility, and longevity. They are, however, susceptible to a transplantable tumor to which one parent is susceptible, the other immune. The dominance of susceptibility to tumor is believed to contradict the theory of dominant favorable factors to account for hybrid vigor, which in this case can be more satisfactorily accounted for by the older heterosis theory.

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