家蚕のNl型致死突然変異体に関する研究,特にNl,Nl1およびNl2胚子について〔英文〕

概要

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A number of larvae showing the Nl phenotype were obtained by irradiation of EHEKp/EHEKp individuals. The three Nl types, Nl, Nl1 and Nl2, were investigated. From crossing experiments, it is assumed that Nl mutants are caused by deficiencies in the part of the 14th chromosome which includes the oa locus and that the order of their relative lengths for the three types is Nl>Nl1>Nl2.It was observed that embryos homozygous for Nl1 die at a far more advanced stage than embryos homozygous for Nl and that the development of the embryos homozygous for Nl2 advances still a little further. Thus, the difference in the extent of the deficiency in each of the three Nl mutants relates to the stage at which the respective homozygous embryos die.Spontaneous Nl type mutation occurs very rarely. However, it may be said from the present experiment that the frequency of the mutation increases strikingly as a result of irradiation with X-rays and that the extent of the deficiency in each of the Nl type mutants is not always the same.
日本遺伝学会の論文