マウスにおける腰椎骨数の遺伝様式

概要

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To be clear the mode of inheritance on the number of lumber vertebrae in mice, two inbred strains of mice which differ in numbers of this vertebrae were crossed reciprocally and propagated into segregating generations. RR inbred strain having 5 lumber vertebrae (5/5) mainly, SS inbred strain having 6 lumber vertebrae (6/6) and their reciprocal hybrids F1 (RS, SR) and F2were used. 1) Frequent appearance of both 5/5 and 6/6 type in the hybrids F1suggested the intermediate between RR and SS strain of their parents. And asymmetrical type (5/6, 6/5) was also appeared with such a frequency of 6.2 to 17.9%. There were no significant differences between RS and SR in the distribution of these types. 2) Distributions of the type of the lumber vertebral number in F2were similar to those in F1with minor frequency of appearance of asymmetrical type. 3) Variances in F2were larger than those in parental inbreds and their F1. From the above results, it seemed that the inheritance of lumber vertebral numbers was explained as multiple-factor model.
日本哺乳類学会の論文