The results reported in this paper agree in the main with those of Little and Detlefsen. More experimental evidence, however, is supplied by the present investigation.
In the present studies, however, the dominant spotting of the “Kasuri” race was distinguished and separately recorded from the recessive ordinary spotting, so the comparison between observation and expectation was more closely dealt with.
The D factor acting upon S, the factor for self, in somewhat restricted fashion on the development of the coat-colour results in the “Kasuri” pattern, and the same factor working upon S’, a factor for the spotting, results in a dark-eyed white of the “Daruma” type.
On the one hand the D factor acts as dominant upon the pattern development as was stated above, and on the other hand it works recessively in regard to the lethal effect. Mice homozygous for this factor perish in the early ontogeny whether they have S or S’ as the hypostatic factors.
The “Kasuri” race often become sterile, especially on the female side. This condition was also found to occur in the “Daruma” race in a few instances.
Volume 100, 2021
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