Comparison of Quantative Genetic Charactors among 4-Way-Cross Hybrid, F_1 hybrids and 4 Inbred Strains of the Mouse.

通过下颌骨测量的多变量分析来评价小鼠四向杂交的有效性。在典型判别分析中，F_1杂交种下颌骨测量的第1和第2典型变量位于原两个自交系下颌骨测量的中间位置。四交杂交种的第一和第二典型变量位于F_1杂交种的中间位置。而且，这些变量每年都是恒定的。四向杂交小鼠的数量性状可能在原自交系中处于中间位置，并且世代稳定，可作为实验动物使用。

Usefulness of 4-way-cross hybrid of the mouse was evaluated by the maltivariate analysis of mandible measurements.In the canonical discriminant analysis, the 1st and 2nd canonical variate of mandible measurment of F_1 hybrid were located on the middle position of those of original two inbred strains. The 1st and 2nd canonical variate of 4-way-cross hybrid was located on the middle position of those of F_1 hybrids. And also, these variates were constant by year.The 4-way-cross hybrid mice were useful as laboratory animals, since quantitative characters might take the middle position among the original inbred strains, and be stable from generation to generation.