Abstract
Three-hundred seventy-five mice of six inbred strains and their F1 hybrid crosses were observed in a barrier apparatus. Frequencies of jumping over barriers were recorded at each of ten 30-sec intervals. Graphs plotted of mean jumps at each time point show several F1 curves with an apparently adaptive pattern: low frequencies of jumps at start, gradually rising, then leveling off. Nine out of 15 F1 curves also show evidence of heterosis: jumping frequencies of hybrids exceed those of parent strains. Lack of heterosis was peculiar to crosses in which C57BL/6 was one of the parents. A coefficient of convexity C was developed to quantify the shapes of the temporal patterns of proportions of animals engaged in jumping at a given point in the sequence. F1 curves (unlike inbred strains) were found, on the whole, to be negatively convex.
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This work was supported by a grant from the Faculty of Social Sciences of The Hebrew University.
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Guttman, R., Lieblich, I. & Frankel, E. Level and shape of sequences of motor behavior in inbred and hybrid mice. Behav Genet 10, 251–261 (1980). https://doi.org/10.1007/BF01067771
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DOI: https://doi.org/10.1007/BF01067771