Abstract
Using 2 tests, mode of inheritance of behavior was studied in 11 inbred strains of mice and 31 groups of F1 hybrids: S was placed on top of a pole and the time spent on it was measured; S was released in a tunnel which opened into a lighted field and latency of emergence into the open field was recorded. In both tests hybrids responded significantly faster than their slower parent but somewhat slower than their faster parent. Thus partial dominance of the faster parent over the slower was indicated. Parent-off-spring correlations, and the correlation between pole test and tunnel emergence test were highly significant (p [less than or equal .001).

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